22115531 has 2 divisors, whose sum is σ = 22115532. Its totient is φ = 22115530.

The previous prime is 22115519. The next prime is 22115537. The reversal of 22115531 is 13551122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22115531 - 2¹⁸ = 21853387 is a prime.

It is a super-2 number, since 2×22115531² = 978193422823922, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (22115537) 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 as a sum of consecutive naturals, namely, 11057765 + 11057766.

It is an arithmetic number, because the mean of its divisors is an integer number (11057766).

Almost surely, 2^22115531 is an apocalyptic number.

22115531 is a deficient number, since it is larger than the sum of its proper divisors (1).

22115531 is an equidigital number, since it uses as much as digits as its factorization.

22115531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 300, while the sum is 20.

The square root of 22115531 is about 4702.7152794955. The cubic root of 22115531 is about 280.6935654702.

Adding to 22115531 its reverse (13551122), we get a palindrome (35666653).

The spelling of 22115531 in words is "twenty-two million, one hundred fifteen thousand, five hundred thirty-one".