22331531 has 2 divisors, whose sum is σ = 22331532. Its totient is φ = 22331530.

The previous prime is 22331513. The next prime is 22331539. The reversal of 22331531 is 13513322.

Together with previous prime (22331513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22331531 - 2¹⁴ = 22315147 is a prime.

It is a super-2 number, since 2×22331531² = 997394553607922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22331539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11165765 + 11165766.

It is an arithmetic number, because the mean of its divisors is an integer number (11165766).

Almost surely, 2^22331531 is an apocalyptic number.

22331531 is a deficient number, since it is larger than the sum of its proper divisors (1).

22331531 is an equidigital number, since it uses as much as digits as its factorization.

22331531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 20.

The square root of 22331531 is about 4725.6249322180. The cubic root of 22331531 is about 281.6044409690.

Adding to 22331531 its reverse (13513322), we get a palindrome (35844853).

The spelling of 22331531 in words is "twenty-two million, three hundred thirty-one thousand, five hundred thirty-one".