91158214979 has 16 divisors (see below), whose sum is σ = 98569747584. Its totient is φ = 83804044800.

The previous prime is 91158214957. The next prime is 91158214993. The reversal of 91158214979 is 97941285119.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 91158214979 - 2¹⁶ = 91158149443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91158204979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8911862 + ... + 8922084.

It is an arithmetic number, because the mean of its divisors is an integer number (6160609224).

Almost surely, 2^91158214979 is an apocalyptic number.

91158214979 is a deficient number, since it is larger than the sum of its proper divisors (7411532605).

91158214979 is a wasteful number, since it uses less digits than its factorization.

91158214979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12958.

The product of its digits is 1632960, while the sum is 56.

The spelling of 91158214979 in words is "ninety-one billion, one hundred fifty-eight million, two hundred fourteen thousand, nine hundred seventy-nine".