22991623 has 2 divisors, whose sum is σ = 22991624. Its totient is φ = 22991622.

The previous prime is 22991621. The next prime is 22991629. The reversal of 22991623 is 32619922.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22991623 - 2¹ = 22991621 is a prime.

It is a super-2 number, since 2×22991623² = 1057229456348258, which contains 22 as substring.

Together with 22991621, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22991621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11495811 + 11495812.

It is an arithmetic number, because the mean of its divisors is an integer number (11495812).

Almost surely, 2^22991623 is an apocalyptic number.

22991623 is a deficient number, since it is larger than the sum of its proper divisors (1).

22991623 is an equidigital number, since it uses as much as digits as its factorization.

22991623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 34.

The square root of 22991623 is about 4794.9580811515. The cubic root of 22991623 is about 284.3521675989.

The spelling of 22991623 in words is "twenty-two million, nine hundred ninety-one thousand, six hundred twenty-three".