22261731 has 4 divisors (see below), whose sum is σ = 29682312. Its totient is φ = 14841152.

The previous prime is 22261727. The next prime is 22261739. The reversal of 22261731 is 13716222.

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 22261731 - 2² = 22261727 is a prime.

It is a super-2 number, since 2×22261731² = 991169334232722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22261739) 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, 3710286 + ... + 3710291.

It is an arithmetic number, because the mean of its divisors is an integer number (7420578).

Almost surely, 2^22261731 is an apocalyptic number.

22261731 is a deficient number, since it is larger than the sum of its proper divisors (7420581).

22261731 is an equidigital number, since it uses as much as digits as its factorization.

22261731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7420580.

The product of its digits is 1008, while the sum is 24.

The square root of 22261731 is about 4718.2338856822. The cubic root of 22261731 is about 281.3107380921.

Adding to 22261731 its reverse (13716222), we get a palindrome (35977953).

The spelling of 22261731 in words is "twenty-two million, two hundred sixty-one thousand, seven hundred thirty-one".