91180000979 has 4 divisors (see below), whose sum is σ = 92540896584. Its totient is φ = 89819105376.

The previous prime is 91180000969. The next prime is 91180000993. The reversal of 91180000979 is 97900008119.

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

It is a cyclic number.

It is not a de Polignac number, because 91180000979 - 2¹⁶ = 91179935443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91180000969) 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, 680447702 + ... + 680447835.

It is an arithmetic number, because the mean of its divisors is an integer number (23135224146).

Almost surely, 2^91180000979 is an apocalyptic number.

91180000979 is a deficient number, since it is larger than the sum of its proper divisors (1360895605).

91180000979 is a wasteful number, since it uses less digits than its factorization.

91180000979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360895604.

The product of its (nonzero) digits is 40824, while the sum is 44.

The spelling of 91180000979 in words is "ninety-one billion, one hundred eighty million, nine hundred seventy-nine", and thus it is an aban number.