23131618 has 8 divisors (see below), whose sum is σ = 35893980. Its totient is φ = 11166960.

The previous prime is 23131613. The next prime is 23131631. The reversal of 23131618 is 81613132.

It can be written as a sum of positive squares in 2 ways, for example, as 23011209 + 120409 = 4797^2 + 347^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 23131592 and 23131601.

It is not an unprimeable number, because it can be changed into a prime (23131613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199353 + ... + 199468.

Almost surely, 2^23131618 is an apocalyptic number.

23131618 is a deficient number, since it is larger than the sum of its proper divisors (12762362).

23131618 is a wasteful number, since it uses less digits than its factorization.

23131618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398852.

The product of its digits is 864, while the sum is 25.

The square root of 23131618 is about 4809.5340730678. The cubic root of 23131618 is about 284.9281361847.

The spelling of 23131618 in words is "twenty-three million, one hundred thirty-one thousand, six hundred eighteen".