23131899 has 32 divisors (see below), whose sum is σ = 39674880. Its totient is φ = 13209480.

The previous prime is 23131897. The next prime is 23131931. The reversal of 23131899 is 99813132.

It is not a de Polignac number, because 23131899 - 2¹ = 23131897 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (23131897) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14554 + ... + 16064.

It is an arithmetic number, because the mean of its divisors is an integer number (1239840).

Almost surely, 2^23131899 is an apocalyptic number.

23131899 is a deficient number, since it is larger than the sum of its proper divisors (16542981).

23131899 is an frugal number, since it uses more digits than its factorization.

23131899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539 (or 1521 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 23131899 is about 4809.5632857880. The cubic root of 23131899 is about 284.9292899371.

The spelling of 23131899 in words is "twenty-three million, one hundred thirty-one thousand, eight hundred ninety-nine".