91625968979 has 4 divisors (see below), whose sum is σ = 92436818376. Its totient is φ = 90815119584.

The previous prime is 91625968937. The next prime is 91625969003. The reversal of 91625968979 is 97986952619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97986952619 = 48221 ⋅2032039.

It is a cyclic number.

It is not a de Polignac number, because 91625968979 - 2³⁶ = 22906492243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91625968919) 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 3 ways as a sum of consecutive naturals, for example, 405424529 + ... + 405424754.

It is an arithmetic number, because the mean of its divisors is an integer number (23109204594).

Almost surely, 2^91625968979 is an apocalyptic number.

91625968979 is a deficient number, since it is larger than the sum of its proper divisors (810849397).

91625968979 is a wasteful number, since it uses less digits than its factorization.

91625968979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810849396.

The product of its digits is 132269760, while the sum is 71.

The spelling of 91625968979 in words is "ninety-one billion, six hundred twenty-five million, nine hundred sixty-eight thousand, nine hundred seventy-nine".