22161431 has 2 divisors, whose sum is σ = 22161432. Its totient is φ = 22161430.

The previous prime is 22161427. The next prime is 22161437. The reversal of 22161431 is 13416122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22161431 - 2² = 22161427 is a prime.

It is a super-2 number, since 2×22161431² = 982258047935522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22161437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11080715 + 11080716.

It is an arithmetic number, because the mean of its divisors is an integer number (11080716).

Almost surely, 2^22161431 is an apocalyptic number.

22161431 is a deficient number, since it is larger than the sum of its proper divisors (1).

22161431 is an equidigital number, since it uses as much as digits as its factorization.

22161431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 20.

The square root of 22161431 is about 4707.5929093328. The cubic root of 22161431 is about 280.8876211259.

Adding to 22161431 its reverse (13416122), we get a palindrome (35577553).

The spelling of 22161431 in words is "twenty-two million, one hundred sixty-one thousand, four hundred thirty-one".