22431891 has 12 divisors (see below), whose sum is σ = 31773272. Its totient is φ = 14074368.

The previous prime is 22431889. The next prime is 22431907. The reversal of 22431891 is 19813422.

It is not a de Polignac number, because 22431891 - 2¹ = 22431889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22431821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12070 + ... + 13803.

Almost surely, 2^22431891 is an apocalyptic number.

22431891 is a deficient number, since it is larger than the sum of its proper divisors (9341381).

22431891 is a wasteful number, since it uses less digits than its factorization.

22431891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25910 (or 25893 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 22431891 is about 4736.2317299727. The cubic root of 22431891 is about 282.0256628725.

The spelling of 22431891 in words is "twenty-two million, four hundred thirty-one thousand, eight hundred ninety-one".