22497731 has 4 divisors (see below), whose sum is σ = 22768872. Its totient is φ = 22226592.

The previous prime is 22497721. The next prime is 22497733. The reversal of 22497731 is 13779422.

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 22497731 - 2²² = 18303427 is a prime.

It is a super-2 number, since 2×22497731² = 1012295800296722, 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 = 22497691 and 22497700.

It is not an unprimeable number, because it can be changed into a prime (22497733) 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, 135446 + ... + 135611.

It is an arithmetic number, because the mean of its divisors is an integer number (5692218).

Almost surely, 2^22497731 is an apocalyptic number.

22497731 is a deficient number, since it is larger than the sum of its proper divisors (271141).

22497731 is an equidigital number, since it uses as much as digits as its factorization.

22497731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271140.

The product of its digits is 21168, while the sum is 35.

The square root of 22497731 is about 4743.1773106221. The cubic root of 22497731 is about 282.3013185197.

The spelling of 22497731 in words is "twenty-two million, four hundred ninety-seven thousand, seven hundred thirty-one".