23156813 has 6 divisors (see below), whose sum is σ = 23629482. Its totient is φ = 22685520.

The previous prime is 23156807. The next prime is 23156831. The reversal of 23156813 is 31865132.

It can be written as a sum of positive squares in 3 ways, for example, as 12411529 + 10745284 = 3523^2 + 3278^2 .

It is not a de Polignac number, because 23156813 - 2⁴ = 23156797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23156803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34703 + ... + 35363.

It is an arithmetic number, because the mean of its divisors is an integer number (3938247).

Almost surely, 2^23156813 is an apocalyptic number.

It is an amenable number.

23156813 is a deficient number, since it is larger than the sum of its proper divisors (472669).

23156813 is an frugal number, since it uses more digits than its factorization.

23156813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375 (or 714 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 23156813 is about 4812.1526368144. The cubic root of 23156813 is about 285.0315467285.

The spelling of 23156813 in words is "twenty-three million, one hundred fifty-six thousand, eight hundred thirteen".