22731631 has 4 divisors (see below), whose sum is σ = 24480232. Its totient is φ = 20983032.

The previous prime is 22731617. The next prime is 22731641. The reversal of 22731631 is 13613722.

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 22731631 - 2¹⁹ = 22207343 is a prime.

It is a super-2 number, since 2×22731631² = 1033454095840322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22731596 and 22731605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22731641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 874281 + ... + 874306.

It is an arithmetic number, because the mean of its divisors is an integer number (6120058).

Almost surely, 2^22731631 is an apocalyptic number.

22731631 is a deficient number, since it is larger than the sum of its proper divisors (1748601).

22731631 is a wasteful number, since it uses less digits than its factorization.

22731631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748600.

The product of its digits is 1512, while the sum is 25.

The square root of 22731631 is about 4767.7700238162. The cubic root of 22731631 is about 283.2762725538.

The spelling of 22731631 in words is "twenty-two million, seven hundred thirty-one thousand, six hundred thirty-one".