Base | Representation |
---|---|
bin | 1110110000001… |
… | …1111001000001 |
3 | 11022102221001000 |
4 | 3230003321001 |
5 | 111320210141 |
6 | 10050202213 |
7 | 1350662523 |
oct | 354037101 |
9 | 138387030 |
10 | 61881921 |
11 | 31a26892 |
12 | 18883369 |
13 | ca8872a |
14 | 830ba13 |
15 | 56755b6 |
hex | 3b03e41 |
61881921 has 32 divisors (see below), whose sum is σ = 100224000. Its totient is φ = 37566720.
The previous prime is 61881901. The next prime is 61881931. The reversal of 61881921 is 12918816.
61881921 is a `hidden beast` number, since 618 + 8 + 19 + 21 = 666.
It is not a de Polignac number, because 61881921 - 29 = 61881409 is a prime.
It is not an unprimeable number, because it can be changed into a prime (61881901) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12055 + ... + 16403.
It is an arithmetic number, because the mean of its divisors is an integer number (3132000).
Almost surely, 261881921 is an apocalyptic number.
It is an amenable number.
61881921 is a deficient number, since it is larger than the sum of its proper divisors (38342079).
61881921 is a wasteful number, since it uses less digits than its factorization.
61881921 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4406 (or 4400 counting only the distinct ones).
The product of its digits is 6912, while the sum is 36.
The square root of 61881921 is about 7866.5062766135. The cubic root of 61881921 is about 395.5377411384.
The spelling of 61881921 in words is "sixty-one million, eight hundred eighty-one thousand, nine hundred twenty-one".
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