91037291 has 2 divisors, whose sum is σ = 91037292. Its totient is φ = 91037290.

The previous prime is 91037273. The next prime is 91037327. The reversal of 91037291 is 19273019.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91037291 - 2¹⁸ = 90775147 is a prime.

It is not a weakly prime, because it can be changed into another prime (91037491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45518645 + 45518646.

It is an arithmetic number, because the mean of its divisors is an integer number (45518646).

Almost surely, 2^91037291 is an apocalyptic number.

91037291 is a deficient number, since it is larger than the sum of its proper divisors (1).

91037291 is an equidigital number, since it uses as much as digits as its factorization.

91037291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 91037291 is about 9541.3463934604. The cubic root of 91037291 is about 449.8555766989.

The spelling of 91037291 in words is "ninety-one million, thirty-seven thousand, two hundred ninety-one".