91976971 has 2 divisors, whose sum is σ = 91976972. Its totient is φ = 91976970.

The previous prime is 91976947. The next prime is 91976993. The reversal of 91976971 is 17967919.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91976971 - 2²³ = 83588363 is a prime.

It is not a weakly prime, because it can be changed into another prime (91976771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45988485 + 45988486.

It is an arithmetic number, because the mean of its divisors is an integer number (45988486).

Almost surely, 2^91976971 is an apocalyptic number.

91976971 is a deficient number, since it is larger than the sum of its proper divisors (1).

91976971 is an equidigital number, since it uses as much as digits as its factorization.

91976971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 214326, while the sum is 49.

The square root of 91976971 is about 9590.4625018818. The cubic root of 91976971 is about 451.3980733253.

The spelling of 91976971 in words is "ninety-one million, nine hundred seventy-six thousand, nine hundred seventy-one".