23157949 has 2 divisors, whose sum is σ = 23157950. Its totient is φ = 23157948.

The previous prime is 23157943. The next prime is 23157983. The reversal of 23157949 is 94975132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16345849 + 6812100 = 4043^2 + 2610^2 .

It is a cyclic number.

It is not a de Polignac number, because 23157949 - 2⁷ = 23157821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23157943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11578974 + 11578975.

It is an arithmetic number, because the mean of its divisors is an integer number (11578975).

Almost surely, 2^23157949 is an apocalyptic number.

It is an amenable number.

23157949 is a deficient number, since it is larger than the sum of its proper divisors (1).

23157949 is an equidigital number, since it uses as much as digits as its factorization.

23157949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 23157949 is about 4812.2706698605. The cubic root of 23157949 is about 285.0362075677.

The spelling of 23157949 in words is "twenty-three million, one hundred fifty-seven thousand, nine hundred forty-nine".