23091257 has 8 divisors (see below), whose sum is σ = 26549376. Its totient is φ = 19672992.

The previous prime is 23091227. The next prime is 23091281. The reversal of 23091257 is 75219032.

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 23091257 - 2²⁰ = 22042681 is a prime.

It is a super-2 number, since 2×23091257² = 1066412299680098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23091217) 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, 8708 + ... + 11045.

It is an arithmetic number, because the mean of its divisors is an integer number (3318672).

Almost surely, 2^23091257 is an apocalyptic number.

It is an amenable number.

23091257 is a deficient number, since it is larger than the sum of its proper divisors (3458119).

23091257 is a wasteful number, since it uses less digits than its factorization.

23091257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19927.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 23091257 is about 4805.3363045681. The cubic root of 23091257 is about 284.7623215906.

The spelling of 23091257 in words is "twenty-three million, ninety-one thousand, two hundred fifty-seven".