91088539979 has 2 divisors, whose sum is σ = 91088539980. Its totient is φ = 91088539978.

The previous prime is 91088539957. The next prime is 91088539991. The reversal of 91088539979 is 97993588019.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91088539979 - 2²⁴ = 91071762763 is a prime.

It is not a weakly prime, because it can be changed into another prime (91088538979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45544269989 + 45544269990.

It is an arithmetic number, because the mean of its divisors is an integer number (45544269990).

Almost surely, 2^91088539979 is an apocalyptic number.

91088539979 is a deficient number, since it is larger than the sum of its proper divisors (1).

91088539979 is an equidigital number, since it uses as much as digits as its factorization.

91088539979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44089920, while the sum is 68.

The spelling of 91088539979 in words is "ninety-one billion, eighty-eight million, five hundred thirty-nine thousand, nine hundred seventy-nine".