91253857 has 8 divisors (see below), whose sum is σ = 95333184. Its totient is φ = 87183888.

The previous prime is 91253843. The next prime is 91253873. The reversal of 91253857 is 75835219.

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 91253857 - 2¹⁵ = 91221089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91253887) 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, 24063 + ... + 27595.

It is an arithmetic number, because the mean of its divisors is an integer number (11916648).

Almost surely, 2^91253857 is an apocalyptic number.

It is an amenable number.

91253857 is a deficient number, since it is larger than the sum of its proper divisors (4079327).

91253857 is a wasteful number, since it uses less digits than its factorization.

91253857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4679.

The product of its digits is 75600, while the sum is 40.

The square root of 91253857 is about 9552.6884697450. The cubic root of 91253857 is about 450.2120103870.

The spelling of 91253857 in words is "ninety-one million, two hundred fifty-three thousand, eight hundred fifty-seven".