91657249 has 2 divisors, whose sum is σ = 91657250. Its totient is φ = 91657248.

The previous prime is 91657243. The next prime is 91657259. The reversal of 91657249 is 94275619.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78004224 + 13653025 = 8832^2 + 3695^2 .

It is a cyclic number.

It is not a de Polignac number, because 91657249 - 2²³ = 83268641 is a prime.

It is not a weakly prime, because it can be changed into another prime (91657243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45828624 + 45828625.

It is an arithmetic number, because the mean of its divisors is an integer number (45828625).

Almost surely, 2^91657249 is an apocalyptic number.

It is an amenable number.

91657249 is a deficient number, since it is larger than the sum of its proper divisors (1).

91657249 is an equidigital number, since it uses as much as digits as its factorization.

91657249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 91657249 is about 9573.7792433291. The cubic root of 91657249 is about 450.8744297685.

The spelling of 91657249 in words is "ninety-one million, six hundred fifty-seven thousand, two hundred forty-nine".