91957259139 has 16 divisors (see below), whose sum is σ = 125621121024. Its totient is φ = 59799617600.

The previous prime is 91957259083. The next prime is 91957259153. The reversal of 91957259139 is 93195275919.

It is a cyclic number.

It is not a de Polignac number, because 91957259139 - 2¹² = 91957255043 is a prime.

It is a super-2 number, since 2×91957259139² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91957252139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 717022 + ... + 835484.

It is an arithmetic number, because the mean of its divisors is an integer number (7851320064).

Almost surely, 2^91957259139 is an apocalyptic number.

91957259139 is a deficient number, since it is larger than the sum of its proper divisors (33663861885).

91957259139 is a wasteful number, since it uses less digits than its factorization.

91957259139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124818.

The product of its digits is 6889050, while the sum is 60.

The spelling of 91957259139 in words is "ninety-one billion, nine hundred fifty-seven million, two hundred fifty-nine thousand, one hundred thirty-nine".