91265506957 has 4 divisors (see below), whose sum is σ = 91266217020. Its totient is φ = 91264796896.

The previous prime is 91265506931. The next prime is 91265506967. The reversal of 91265506957 is 75960556219.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 75960556219 = 71 ⋅1069866989.

It can be written as a sum of positive squares in 2 ways, for example, as 33748996681 + 57516510276 = 183709^2 + 239826^2 .

It is a cyclic number.

It is not a de Polignac number, because 91265506957 - 2³⁵ = 56905768589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91265506898 and 91265506907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91265506967) 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, 102232 + ... + 439297.

It is an arithmetic number, because the mean of its divisors is an integer number (22816554255).

Almost surely, 2^91265506957 is an apocalyptic number.

It is an amenable number.

91265506957 is a deficient number, since it is larger than the sum of its proper divisors (710063).

91265506957 is a wasteful number, since it uses less digits than its factorization.

91265506957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710062.

The product of its (nonzero) digits is 5103000, while the sum is 55.

The spelling of 91265506957 in words is "ninety-one billion, two hundred sixty-five million, five hundred six thousand, nine hundred fifty-seven".