91256094913 has 4 divisors (see below), whose sum is σ = 91267345620. Its totient is φ = 91244844208.

The previous prime is 91256094871. The next prime is 91256094931. The reversal of 91256094913 is 31949065219.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83147452609 + 8108642304 = 288353^2 + 90048^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91256094913 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91256094953) 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, 5613178 + ... + 5629411.

It is an arithmetic number, because the mean of its divisors is an integer number (22816836405).

Almost surely, 2^91256094913 is an apocalyptic number.

It is an amenable number.

91256094913 is a deficient number, since it is larger than the sum of its proper divisors (11250707).

91256094913 is a wasteful number, since it uses less digits than its factorization.

91256094913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11250706.

The product of its (nonzero) digits is 524880, while the sum is 49.

The spelling of 91256094913 in words is "ninety-one billion, two hundred fifty-six million, ninety-four thousand, nine hundred thirteen".