61591525 has 12 divisors (see below), whose sum is σ = 76663744. Its totient is φ = 49086000.

The previous prime is 61591477. The next prime is 61591549. The reversal of 61591525 is 52519516.

It is a de Polignac number, because none of the positive numbers 2^k-61591525 is a prime.

It is a super-3 number, since 3×61591525³ (a number of 24 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2230 + ... + 11320.

Almost surely, 2^61591525 is an apocalyptic number.

It is an amenable number.

61591525 is a deficient number, since it is larger than the sum of its proper divisors (15072219).

61591525 is a wasteful number, since it uses less digits than its factorization.

61591525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9372 (or 9367 counting only the distinct ones).

The product of its digits is 13500, while the sum is 34.

The square root of 61591525 is about 7848.0268220745. The cubic root of 61591525 is about 394.9180516854.

The spelling of 61591525 in words is "sixty-one million, five hundred ninety-one thousand, five hundred twenty-five".