91256121 has 12 divisors (see below), whose sum is σ = 143797680. Its totient is φ = 55306680.

The previous prime is 91256117. The next prime is 91256129. The reversal of 91256121 is 12165219.

It is not a de Polignac number, because 91256121 - 2² = 91256117 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91256129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 460791 + ... + 460988.

It is an arithmetic number, because the mean of its divisors is an integer number (11983140).

Almost surely, 2^91256121 is an apocalyptic number.

It is an amenable number.

91256121 is a deficient number, since it is larger than the sum of its proper divisors (52541559).

91256121 is a wasteful number, since it uses less digits than its factorization.

91256121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921796 (or 921793 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 91256121 is about 9552.8069696817. The cubic root of 91256121 is about 450.2157335961.

The spelling of 91256121 in words is "ninety-one million, two hundred fifty-six thousand, one hundred twenty-one".