23156729 has 2 divisors, whose sum is σ = 23156730. Its totient is φ = 23156728.

The previous prime is 23156689. The next prime is 23156743. The reversal of 23156729 is 92765132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20748025 + 2408704 = 4555^2 + 1552^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23156729 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23156129) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11578364 + 11578365.

It is an arithmetic number, because the mean of its divisors is an integer number (11578365).

Almost surely, 2^23156729 is an apocalyptic number.

It is an amenable number.

23156729 is a deficient number, since it is larger than the sum of its proper divisors (1).

23156729 is an equidigital number, since it uses as much as digits as its factorization.

23156729 is an odious number, because the sum of its binary digits is odd.

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

The square root of 23156729 is about 4812.1439089038. The cubic root of 23156729 is about 285.0312020830.

The spelling of 23156729 in words is "twenty-three million, one hundred fifty-six thousand, seven hundred twenty-nine".