91976789431 has 2 divisors, whose sum is σ = 91976789432. Its totient is φ = 91976789430.

The previous prime is 91976789363. The next prime is 91976789447. The reversal of 91976789431 is 13498767919.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91976789431 - 2²¹ = 91974692279 is a prime.

It is a super-2 number, since 2×91976789431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91976729431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45988394715 + 45988394716.

It is an arithmetic number, because the mean of its divisors is an integer number (45988394716).

Almost surely, 2^91976789431 is an apocalyptic number.

91976789431 is a deficient number, since it is larger than the sum of its proper divisors (1).

91976789431 is an equidigital number, since it uses as much as digits as its factorization.

91976789431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20575296, while the sum is 64.

The spelling of 91976789431 in words is "ninety-one billion, nine hundred seventy-six million, seven hundred eighty-nine thousand, four hundred thirty-one".