91830554979 has 4 divisors (see below), whose sum is σ = 122440739976. Its totient is φ = 61220369984.

The previous prime is 91830554971. The next prime is 91830554989. The reversal of 91830554979 is 97945503819.

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 91830554979 - 2³ = 91830554971 is a prime.

It is a super-2 number, since 2×91830554979² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91830554971) 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, 15305092494 + ... + 15305092499.

It is an arithmetic number, because the mean of its divisors is an integer number (30610184994).

Almost surely, 2^91830554979 is an apocalyptic number.

91830554979 is a deficient number, since it is larger than the sum of its proper divisors (30610184997).

91830554979 is a wasteful number, since it uses less digits than its factorization.

91830554979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30610184996.

The product of its (nonzero) digits is 12247200, while the sum is 60.

The spelling of 91830554979 in words is "ninety-one billion, eight hundred thirty million, five hundred fifty-four thousand, nine hundred seventy-nine".