22431691 has 4 divisors (see below), whose sum is σ = 22488592. Its totient is φ = 22374792.

The previous prime is 22431683. The next prime is 22431709. The reversal of 22431691 is 19613422.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22431691 - 2³ = 22431683 is a prime.

It is a super-2 number, since 2×22431691² = 1006361522238962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22431671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27855 + ... + 28648.

It is an arithmetic number, because the mean of its divisors is an integer number (5622148).

Almost surely, 2^22431691 is an apocalyptic number.

22431691 is a deficient number, since it is larger than the sum of its proper divisors (56901).

22431691 is an equidigital number, since it uses as much as digits as its factorization.

22431691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56900.

The product of its digits is 2592, while the sum is 28.

The square root of 22431691 is about 4736.2106160938. The cubic root of 22431691 is about 282.0248247012.

The spelling of 22431691 in words is "twenty-two million, four hundred thirty-one thousand, six hundred ninety-one".