22397531 has 16 divisors (see below), whose sum is σ = 25132800. Its totient is φ = 19820160.

The previous prime is 22397519. The next prime is 22397533. The reversal of 22397531 is 13579322.

It is not a de Polignac number, because 22397531 - 2¹⁸ = 22135387 is a prime.

It is a super-2 number, since 2×22397531² = 1003298789791922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22397533) 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 15 ways as a sum of consecutive naturals, for example, 59861 + ... + 60233.

It is an arithmetic number, because the mean of its divisors is an integer number (1570800).

Almost surely, 2^22397531 is an apocalyptic number.

22397531 is a deficient number, since it is larger than the sum of its proper divisors (2735269).

22397531 is a wasteful number, since it uses less digits than its factorization.

22397531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566.

The product of its digits is 11340, while the sum is 32.

The square root of 22397531 is about 4732.6029835599. The cubic root of 22397531 is about 281.8815918898.

It can be divided in two parts, 223975 and 31, that multiplied together give a square (6943225 = 2635²).

The spelling of 22397531 in words is "twenty-two million, three hundred ninety-seven thousand, five hundred thirty-one".