91292491 has 2 divisors, whose sum is σ = 91292492. Its totient is φ = 91292490.

The previous prime is 91292477. The next prime is 91292521. The reversal of 91292491 is 19429219.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91292491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91292491.

It is not a weakly prime, because it can be changed into another prime (91292401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45646245 + 45646246.

It is an arithmetic number, because the mean of its divisors is an integer number (45646246).

Almost surely, 2^91292491 is an apocalyptic number.

91292491 is a deficient number, since it is larger than the sum of its proper divisors (1).

91292491 is an equidigital number, since it uses as much as digits as its factorization.

91292491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 37.

The square root of 91292491 is about 9554.7104090077. The cubic root of 91292491 is about 450.2755366033.

The spelling of 91292491 in words is "ninety-one million, two hundred ninety-two thousand, four hundred ninety-one".