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61520201 = 521118081
BaseRepresentation
bin1110101010101…
…1100101001001
311021202112211222
43222223211021
5111222121301
610034331425
71344625121
oct352534511
9137675758
1061520201
11317aa046
1218729b75
13c98cbb2
148255c81
15560331b
hex3aab949

61520201 has 4 divisors (see below), whose sum is σ = 61638804. Its totient is φ = 61401600.

The previous prime is 61520191. The next prime is 61520203. The reversal of 61520201 is 10202516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23377225 + 38142976 = 4835^2 + 6176^2 .

It is a cyclic number.

It is not a de Polignac number, because 61520201 - 210 = 61519177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61520201.

It is not an unprimeable number, because it can be changed into a prime (61520203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58520 + ... + 59561.

It is an arithmetic number, because the mean of its divisors is an integer number (15409701).

Almost surely, 261520201 is an apocalyptic number.

It is an amenable number.

61520201 is a deficient number, since it is larger than the sum of its proper divisors (118603).

61520201 is a wasteful number, since it uses less digits than its factorization.

61520201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118602.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 61520201 is about 7843.4814336492. The cubic root of 61520201 is about 394.7655522694.

Adding to 61520201 its reverse (10202516), we get a palindrome (71722717).

The spelling of 61520201 in words is "sixty-one million, five hundred twenty thousand, two hundred one".

Divisors: 1 521 118081 61520201