91442971 has 2 divisors, whose sum is σ = 91442972. Its totient is φ = 91442970.

The previous prime is 91442951. The next prime is 91442977. The reversal of 91442971 is 17924419.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91442971 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91442971.

It is not a weakly prime, because it can be changed into another prime (91442977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45721485 + 45721486.

It is an arithmetic number, because the mean of its divisors is an integer number (45721486).

Almost surely, 2^91442971 is an apocalyptic number.

91442971 is a deficient number, since it is larger than the sum of its proper divisors (1).

91442971 is an equidigital number, since it uses as much as digits as its factorization.

91442971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 91442971 is about 9562.5818166435. The cubic root of 91442971 is about 450.5228014375.

The spelling of 91442971 in words is "ninety-one million, four hundred forty-two thousand, nine hundred seventy-one".