22551399 has 32 divisors (see below), whose sum is σ = 36771840. Its totient is φ = 13572576.

The previous prime is 22551391. The next prime is 22551409. The reversal of 22551399 is 99315522.

It is a happy number.

It is not a de Polignac number, because 22551399 - 2³ = 22551391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22551391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15814 + ... + 17180.

It is an arithmetic number, because the mean of its divisors is an integer number (1149120).

Almost surely, 2^22551399 is an apocalyptic number.

22551399 is a deficient number, since it is larger than the sum of its proper divisors (14220441).

22551399 is a wasteful number, since it uses less digits than its factorization.

22551399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436 (or 1430 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 22551399 is about 4748.8313299169. The cubic root of 22551399 is about 282.5256154495.

The spelling of 22551399 in words is "twenty-two million, five hundred fifty-one thousand, three hundred ninety-nine".