22431391 has 2 divisors, whose sum is σ = 22431392. Its totient is φ = 22431390.

The previous prime is 22431379. The next prime is 22431427. The reversal of 22431391 is 19313422.

22431391 is nontrivially palindromic in base 12.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22431391 - 2⁵ = 22431359 is a prime.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11215695 + 11215696.

It is an arithmetic number, because the mean of its divisors is an integer number (11215696).

Almost surely, 2^22431391 is an apocalyptic number.

22431391 is a deficient number, since it is larger than the sum of its proper divisors (1).

22431391 is an equidigital number, since it uses as much as digits as its factorization.

22431391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

The square root of 22431391 is about 4736.1789450991. The cubic root of 22431391 is about 282.0235674350.

It can be divided in two parts, 22431 and 391, that added together give a palindrome (22822).

The spelling of 22431391 in words is "twenty-two million, four hundred thirty-one thousand, three hundred ninety-one".