91055772131 has 8 divisors (see below), whose sum is σ = 93299716944. Its totient is φ = 88812926080.

The previous prime is 91055772043. The next prime is 91055772133. The reversal of 91055772131 is 13127755019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91055772131 - 2²⁶ = 90988663267 is a prime.

It is a super-2 number, since 2×91055772131² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91055772133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105641 + ... + 439626.

It is an arithmetic number, because the mean of its divisors is an integer number (11662464618).

Almost surely, 2^91055772131 is an apocalyptic number.

91055772131 is a deficient number, since it is larger than the sum of its proper divisors (2243944813).

91055772131 is a wasteful number, since it uses less digits than its factorization.

91055772131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549381.

The product of its (nonzero) digits is 66150, while the sum is 41.

The spelling of 91055772131 in words is "ninety-one billion, fifty-five million, seven hundred seventy-two thousand, one hundred thirty-one".