23155631 has 4 divisors (see below), whose sum is σ = 23648352. Its totient is φ = 22662912.

The previous prime is 23155597. The next prime is 23155637. The reversal of 23155631 is 13655132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23155631 - 2⁶ = 23155567 is a prime.

It is a super-2 number, since 2×23155631² = 1072366494016322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23155631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23155637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246290 + ... + 246383.

It is an arithmetic number, because the mean of its divisors is an integer number (5912088).

Almost surely, 2^23155631 is an apocalyptic number.

23155631 is a deficient number, since it is larger than the sum of its proper divisors (492721).

23155631 is an equidigital number, since it uses as much as digits as its factorization.

23155631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492720.

The product of its digits is 2700, while the sum is 26.

The square root of 23155631 is about 4812.0298211877. The cubic root of 23155631 is about 285.0266969964.

The spelling of 23155631 in words is "twenty-three million, one hundred fifty-five thousand, six hundred thirty-one".