22991307 has 4 divisors (see below), whose sum is σ = 30655080. Its totient is φ = 15327536.

The previous prime is 22991303. The next prime is 22991317. The reversal of 22991307 is 70319922.

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 22991307 - 2² = 22991303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22991303) 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, 3831882 + ... + 3831887.

It is an arithmetic number, because the mean of its divisors is an integer number (7663770).

Almost surely, 2^22991307 is an apocalyptic number.

22991307 is a deficient number, since it is larger than the sum of its proper divisors (7663773).

22991307 is an equidigital number, since it uses as much as digits as its factorization.

22991307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7663772.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 22991307 is about 4794.9251297596. The cubic root of 22991307 is about 284.3508648679.

The spelling of 22991307 in words is "twenty-two million, nine hundred ninety-one thousand, three hundred seven".