91314257 has 8 divisors (see below), whose sum is σ = 93691080. Its totient is φ = 88944640.

The previous prime is 91314253. The next prime is 91314269. The reversal of 91314257 is 75241319.

It can be written as a sum of positive squares in 4 ways, for example, as 27888961 + 63425296 = 5281^2 + 7964^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91314257 - 2² = 91314253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91314253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31793 + ... + 34545.

It is an arithmetic number, because the mean of its divisors is an integer number (11711385).

Almost surely, 2^91314257 is an apocalyptic number.

It is an amenable number.

91314257 is a deficient number, since it is larger than the sum of its proper divisors (2376823).

91314257 is a wasteful number, since it uses less digits than its factorization.

91314257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3603.

The product of its digits is 7560, while the sum is 32.

The square root of 91314257 is about 9555.8493604703. The cubic root of 91314257 is about 450.3113187304.

The spelling of 91314257 in words is "ninety-one million, three hundred fourteen thousand, two hundred fifty-seven".