91570232525 has 24 divisors (see below), whose sum is σ = 117693750600. Its totient is φ = 70590867200.

The previous prime is 91570232503. The next prime is 91570232609. The reversal of 91570232525 is 52523207519.

It can be written as a sum of positive squares in 12 ways, for example, as 12891104521 + 78679128004 = 113539^2 + 280498^2 .

It is not a de Polignac number, because 91570232525 - 2¹² = 91570228429 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 244955 + ... + 493095.

It is an arithmetic number, because the mean of its divisors is an integer number (4903906275).

Almost surely, 2^91570232525 is an apocalyptic number.

It is an amenable number.

91570232525 is a deficient number, since it is larger than the sum of its proper divisors (26123518075).

91570232525 is a wasteful number, since it uses less digits than its factorization.

91570232525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248689 (or 248684 counting only the distinct ones).

The product of its (nonzero) digits is 189000, while the sum is 41.

The spelling of 91570232525 in words is "ninety-one billion, five hundred seventy million, two hundred thirty-two thousand, five hundred twenty-five".