22945991 has 2 divisors, whose sum is σ = 22945992. Its totient is φ = 22945990.

The previous prime is 22945987. The next prime is 22945997. The reversal of 22945991 is 19954922.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22945991 - 2² = 22945987 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22945997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11472995 + 11472996.

It is an arithmetic number, because the mean of its divisors is an integer number (11472996).

Almost surely, 2^22945991 is an apocalyptic number.

22945991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22945991 is an equidigital number, since it uses as much as digits as its factorization.

22945991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 41.

The square root of 22945991 is about 4790.1973863297. The cubic root of 22945991 is about 284.1639229226.

It can be divided in two parts, 22 and 945991, that multiplied together give a palindrome (20811802).

The spelling of 22945991 in words is "twenty-two million, nine hundred forty-five thousand, nine hundred ninety-one".