23691257 has 2 divisors, whose sum is σ = 23691258. Its totient is φ = 23691256.

The previous prime is 23691253. The next prime is 23691281. The reversal of 23691257 is 75219632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23658496 + 32761 = 4864^2 + 181^2 .

It is a cyclic number.

It is not a de Polignac number, because 23691257 - 2² = 23691253 is a prime.

It is a super-2 number, since 2×23691257² = 1122551316480098, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23691253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11845628 + 11845629.

It is an arithmetic number, because the mean of its divisors is an integer number (11845629).

Almost surely, 2^23691257 is an apocalyptic number.

It is an amenable number.

23691257 is a deficient number, since it is larger than the sum of its proper divisors (1).

23691257 is an equidigital number, since it uses as much as digits as its factorization.

23691257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 35.

The square root of 23691257 is about 4867.3665364343. The cubic root of 23691257 is about 287.2076705987.

The spelling of 23691257 in words is "twenty-three million, six hundred ninety-one thousand, two hundred fifty-seven".