23156621929 has 9 divisors (see below), whose sum is σ = 26938534077. Its totient is φ = 19847620044.

The previous prime is 23156621911. The next prime is 23156621951. The reversal of 23156621929 is 92912665132.

The square root of 23156621929 is 152173.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 23156621929 - 2³¹ = 21009138281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23156621909) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1054342 + ... + 1076080.

It is an arithmetic number, because the mean of its divisors is an integer number (2993170453).

Almost surely, 2^23156621929 is an apocalyptic number.

23156621929 is the 152173-rd square number.

23156621929 is the 76087-th centered octagonal number.

It is an amenable number.

23156621929 is a deficient number, since it is larger than the sum of its proper divisors (3781912148).

23156621929 is an frugal number, since it uses more digits than its factorization.

23156621929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43492 (or 21746 counting only the distinct ones).

The product of its digits is 349920, while the sum is 46.

The spelling of 23156621929 in words is "twenty-three billion, one hundred fifty-six million, six hundred twenty-one thousand, nine hundred twenty-nine".