| Base | Representation |
|---|---|
| bin | 1110110001110… |
| … | …0010001110100 |
| 3 | 11022122000001200 |
| 4 | 3230130101310 |
| 5 | 111331404222 |
| 6 | 10052252500 |
| 7 | 1351556664 |
| oct | 354342164 |
| 9 | 138560050 |
| 10 | 61981812 |
| 11 | 31a94942 |
| 12 | 18911130 |
| 13 | cac2039 |
| 14 | 83361a4 |
| 15 | 5694eac |
| hex | 3b1c474 |
61981812 has 18 divisors (see below), whose sum is σ = 156676338. Its totient is φ = 20660592.
The previous prime is 61981763. The next prime is 61981817. The reversal of 61981812 is 21818916.
61981812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It can be written as a sum of positive squares in only one way, i.e., 58155876 + 3825936 = 7626^2 + 1956^2 .
It is a tau number, because it is divible by the number of its divisors (18).
It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.
It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1721717 = 61981812 / (6 + 1 + 9 + 8 + 1 + 8 + 1 + 2).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (61981817) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 860823 + ... + 860894.
It is an arithmetic number, because the mean of its divisors is an integer number (8704241).
Almost surely, 261981812 is an apocalyptic number.
It is an amenable number.
61981812 is an abundant number, since it is smaller than the sum of its proper divisors (94694526).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
61981812 is a wasteful number, since it uses less digits than its factorization.
61981812 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1721727 (or 1721722 counting only the distinct ones).
The product of its digits is 6912, while the sum is 36.
The square root of 61981812 is about 7872.8528501427. The cubic root of 61981812 is about 395.7504549611.
The spelling of 61981812 in words is "sixty-one million, nine hundred eighty-one thousand, eight hundred twelve".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.108 sec. • engine limits •