91954921979 has 2 divisors, whose sum is σ = 91954921980. Its totient is φ = 91954921978.

The previous prime is 91954921967. The next prime is 91954921987. The reversal of 91954921979 is 97912945919.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91954921979 - 2⁴ = 91954921963 is a prime.

It is not a weakly prime, because it can be changed into another prime (91954924979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45977460989 + 45977460990.

It is an arithmetic number, because the mean of its divisors is an integer number (45977460990).

Almost surely, 2^91954921979 is an apocalyptic number.

91954921979 is a deficient number, since it is larger than the sum of its proper divisors (1).

91954921979 is an equidigital number, since it uses as much as digits as its factorization.

91954921979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16533720, while the sum is 65.

The spelling of 91954921979 in words is "ninety-one billion, nine hundred fifty-four million, nine hundred twenty-one thousand, nine hundred seventy-nine".