22991207 has 2 divisors, whose sum is σ = 22991208. Its totient is φ = 22991206.

The previous prime is 22991173. The next prime is 22991219. The reversal of 22991207 is 70219922.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22991207 - 2⁸ = 22990951 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22991407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11495603 + 11495604.

It is an arithmetic number, because the mean of its divisors is an integer number (11495604).

Almost surely, 2^22991207 is an apocalyptic number.

22991207 is a deficient number, since it is larger than the sum of its proper divisors (1).

22991207 is an equidigital number, since it uses as much as digits as its factorization.

22991207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 22991207 is about 4794.9147020568. The cubic root of 22991207 is about 284.3504526088.

The spelling of 22991207 in words is "twenty-two million, nine hundred ninety-one thousand, two hundred seven".