22138631 has 2 divisors, whose sum is σ = 22138632. Its totient is φ = 22138630.

The previous prime is 22138583. The next prime is 22138643. The reversal of 22138631 is 13683122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22138631 is a prime.

It is a super-2 number, since 2×22138631² = 980237965108322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22138631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22138651) 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, 11069315 + 11069316.

It is an arithmetic number, because the mean of its divisors is an integer number (11069316).

Almost surely, 2^22138631 is an apocalyptic number.

22138631 is a deficient number, since it is larger than the sum of its proper divisors (1).

22138631 is an equidigital number, since it uses as much as digits as its factorization.

22138631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 22138631 is about 4705.1706664052. The cubic root of 22138631 is about 280.7912609935.

The spelling of 22138631 in words is "twenty-two million, one hundred thirty-eight thousand, six hundred thirty-one".