23891657 has 2 divisors, whose sum is σ = 23891658. Its totient is φ = 23891656.

The previous prime is 23891639. The next prime is 23891671. The reversal of 23891657 is 75619832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23775376 + 116281 = 4876^2 + 341^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23891657 is a prime.

It is a super-2 number, since 2×23891657² = 1141622548411298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23891627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11945828 + 11945829.

It is an arithmetic number, because the mean of its divisors is an integer number (11945829).

Almost surely, 2^23891657 is an apocalyptic number.

It is an amenable number.

23891657 is a deficient number, since it is larger than the sum of its proper divisors (1).

23891657 is an equidigital number, since it uses as much as digits as its factorization.

23891657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 23891657 is about 4887.9092667520. The cubic root of 23891657 is about 288.0152102628.

The spelling of 23891657 in words is "twenty-three million, eight hundred ninety-one thousand, six hundred fifty-seven".