91377257 has 2 divisors, whose sum is σ = 91377258. Its totient is φ = 91377256.

The previous prime is 91377203. The next prime is 91377263. The reversal of 91377257 is 75277319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85082176 + 6295081 = 9224^2 + 2509^2 .

It is a cyclic number.

It is not a de Polignac number, because 91377257 - 2⁸ = 91377001 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91377287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45688628 + 45688629.

It is an arithmetic number, because the mean of its divisors is an integer number (45688629).

Almost surely, 2^91377257 is an apocalyptic number.

It is an amenable number.

91377257 is a deficient number, since it is larger than the sum of its proper divisors (1).

91377257 is an equidigital number, since it uses as much as digits as its factorization.

91377257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92610, while the sum is 41.

The square root of 91377257 is about 9559.1452023703. The cubic root of 91377257 is about 450.4148552872.

The spelling of 91377257 in words is "ninety-one million, three hundred seventy-seven thousand, two hundred fifty-seven".