91510531051 has 4 divisors (see below), whose sum is σ = 91585356912. Its totient is φ = 91435705192.

The previous prime is 91510531033. The next prime is 91510531069. The reversal of 91510531051 is 15013501519.

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

It is an interprime number because it is at equal distance from previous prime (91510531033) and next prime (91510531069).

It is a cyclic number.

It is not a de Polignac number, because 91510531051 - 2²⁷ = 91376313323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91510531001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37411096 + ... + 37413541.

It is an arithmetic number, because the mean of its divisors is an integer number (22896339228).

Almost surely, 2^91510531051 is an apocalyptic number.

91510531051 is a deficient number, since it is larger than the sum of its proper divisors (74825861).

91510531051 is a wasteful number, since it uses less digits than its factorization.

91510531051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74825860.

The product of its (nonzero) digits is 3375, while the sum is 31.

The spelling of 91510531051 in words is "ninety-one billion, five hundred ten million, five hundred thirty-one thousand, fifty-one".