9255212991 has 6 divisors (see below), whose sum is σ = 13368641000. Its totient is φ = 6170141988.

The previous prime is 9255212977. The next prime is 9255213007. The reversal of 9255212991 is 1992125529.

9255212991 is a `hidden beast` number, since 9 + 2 + 552 + 1 + 2 + 9 + 91 = 666.

It is not a de Polignac number, because 9255212991 - 2⁵ = 9255212959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9255212921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 514178491 + ... + 514178508.

Almost surely, 2^9255212991 is an apocalyptic number.

9255212991 is a deficient number, since it is larger than the sum of its proper divisors (4113428009).

9255212991 is a wasteful number, since it uses less digits than its factorization.

9255212991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028357005 (or 1028357002 counting only the distinct ones).

The product of its digits is 145800, while the sum is 45.

The square root of 9255212991 is about 96204.0175408491. The cubic root of 9255212991 is about 2099.5624932114.

The spelling of 9255212991 in words is "nine billion, two hundred fifty-five million, two hundred twelve thousand, nine hundred ninety-one".