91295257 has 8 divisors (see below), whose sum is σ = 95368896. Its totient is φ = 87230352.

The previous prime is 91295249. The next prime is 91295261. The reversal of 91295257 is 75259219.

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

It is not a de Polignac number, because 91295257 - 2³ = 91295249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91295207) 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, 28543 + ... + 31579.

It is an arithmetic number, because the mean of its divisors is an integer number (11921112).

Almost surely, 2^91295257 is an apocalyptic number.

It is an amenable number.

91295257 is a deficient number, since it is larger than the sum of its proper divisors (4073639).

91295257 is a wasteful number, since it uses less digits than its factorization.

91295257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4367.

The product of its digits is 56700, while the sum is 40.

The square root of 91295257 is about 9554.8551532716. The cubic root of 91295257 is about 450.2800840732.

It can be divided in two parts, 912 and 95257, that added together give a palindrome (96169).

The spelling of 91295257 in words is "ninety-one million, two hundred ninety-five thousand, two hundred fifty-seven".