22991431 has 2 divisors, whose sum is σ = 22991432. Its totient is φ = 22991430.

The previous prime is 22991407. The next prime is 22991443. The reversal of 22991431 is 13419922.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22991431 - 2⁵ = 22991399 is a prime.

It is a super-2 number, since 2×22991431² = 1057211798855522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22991393 and 22991402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22991401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11495715 + 11495716.

It is an arithmetic number, because the mean of its divisors is an integer number (11495716).

Almost surely, 2^22991431 is an apocalyptic number.

22991431 is a deficient number, since it is larger than the sum of its proper divisors (1).

22991431 is an equidigital number, since it uses as much as digits as its factorization.

22991431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 31.

The square root of 22991431 is about 4794.9380600796. The cubic root of 22991431 is about 284.3513760676.

The spelling of 22991431 in words is "twenty-two million, nine hundred ninety-one thousand, four hundred thirty-one".