22431289 has 2 divisors, whose sum is σ = 22431290. Its totient is φ = 22431288.

The previous prime is 22431281. The next prime is 22431307. The reversal of 22431289 is 98213422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11594025 + 10837264 = 3405^2 + 3292^2 .

It is a cyclic number.

It is not a de Polignac number, because 22431289 - 2³ = 22431281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22431289.

It is not a weakly prime, because it can be changed into another prime (22431281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11215644 + 11215645.

It is an arithmetic number, because the mean of its divisors is an integer number (11215645).

Almost surely, 2^22431289 is an apocalyptic number.

It is an amenable number.

22431289 is a deficient number, since it is larger than the sum of its proper divisors (1).

22431289 is an equidigital number, since it uses as much as digits as its factorization.

22431289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 31.

The square root of 22431289 is about 4736.1681769126. The cubic root of 22431289 is about 282.0231399619.

It can be divided in two parts, 224 and 31289, that added together give a palindrome (31513).

The spelling of 22431289 in words is "twenty-two million, four hundred thirty-one thousand, two hundred eighty-nine".