91945257 has 8 divisors (see below), whose sum is σ = 122637984. Its totient is φ = 61274688.

The previous prime is 91945253. The next prime is 91945267. The reversal of 91945257 is 75254919.

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

It is not a de Polignac number, because 91945257 - 2² = 91945253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91945253) 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, 13338 + ... + 19020.

It is an arithmetic number, because the mean of its divisors is an integer number (15329748).

Almost surely, 2^91945257 is an apocalyptic number.

It is an amenable number.

91945257 is a deficient number, since it is larger than the sum of its proper divisors (30692727).

91945257 is a wasteful number, since it uses less digits than its factorization.

91945257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11079.

The product of its digits is 113400, while the sum is 42.

The square root of 91945257 is about 9588.8089458493. The cubic root of 91945257 is about 451.3461861191.

The spelling of 91945257 in words is "ninety-one million, nine hundred forty-five thousand, two hundred fifty-seven".