22991849 has 2 divisors, whose sum is σ = 22991850. Its totient is φ = 22991848.

The previous prime is 22991833. The next prime is 22991869. The reversal of 22991849 is 94819922.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13579225 + 9412624 = 3685^2 + 3068^2 .

It is a cyclic number.

It is not a de Polignac number, because 22991849 - 2⁴ = 22991833 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22991869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11495924 + 11495925.

It is an arithmetic number, because the mean of its divisors is an integer number (11495925).

Almost surely, 2^22991849 is an apocalyptic number.

It is an amenable number.

22991849 is a deficient number, since it is larger than the sum of its proper divisors (1).

22991849 is an equidigital number, since it uses as much as digits as its factorization.

22991849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 44.

The square root of 22991849 is about 4794.9816475144. The cubic root of 22991849 is about 284.3530992915.

The spelling of 22991849 in words is "twenty-two million, nine hundred ninety-one thousand, eight hundred forty-nine".