23157749 has 2 divisors, whose sum is σ = 23157750. Its totient is φ = 23157748.

The previous prime is 23157727. The next prime is 23157769. The reversal of 23157749 is 94775132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22972849 + 184900 = 4793^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 23157749 - 2⁸ = 23157493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23157769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11578874 + 11578875.

It is an arithmetic number, because the mean of its divisors is an integer number (11578875).

Almost surely, 2^23157749 is an apocalyptic number.

It is an amenable number.

23157749 is a deficient number, since it is larger than the sum of its proper divisors (1).

23157749 is an equidigital number, since it uses as much as digits as its factorization.

23157749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 38.

The square root of 23157749 is about 4812.2498896047. The cubic root of 23157749 is about 285.0353870085.

The spelling of 23157749 in words is "twenty-three million, one hundred fifty-seven thousand, seven hundred forty-nine".