22991687 has 2 divisors, whose sum is σ = 22991688. Its totient is φ = 22991686.

The previous prime is 22991681. The next prime is 22991707. The reversal of 22991687 is 78619922.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22991687 - 2⁴ = 22991671 is a prime.

It is a super-2 number, since 2×22991687² = 1057235342211938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22991681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11495843 + 11495844.

It is an arithmetic number, because the mean of its divisors is an integer number (11495844).

Almost surely, 2^22991687 is an apocalyptic number.

22991687 is a deficient number, since it is larger than the sum of its proper divisors (1).

22991687 is an equidigital number, since it uses as much as digits as its factorization.

22991687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 22991687 is about 4794.9647548235. The cubic root of 22991687 is about 284.3524314417.

The spelling of 22991687 in words is "twenty-two million, nine hundred ninety-one thousand, six hundred eighty-seven".