22251637 has 4 divisors (see below), whose sum is σ = 22275616. Its totient is φ = 22227660.

The previous prime is 22251631. The next prime is 22251653. The reversal of 22251637 is 73615222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22251637 - 2²³ = 13863029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22251631) 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, 10539 + ... + 12472.

It is an arithmetic number, because the mean of its divisors is an integer number (5568904).

Almost surely, 2^22251637 is an apocalyptic number.

It is an amenable number.

22251637 is a deficient number, since it is larger than the sum of its proper divisors (23979).

22251637 is an equidigital number, since it uses as much as digits as its factorization.

22251637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23978.

The product of its digits is 5040, while the sum is 28.

The square root of 22251637 is about 4717.1640844897. The cubic root of 22251637 is about 281.2682139974.

Adding to 22251637 its reverse (73615222), we get a palindrome (95866859).

The spelling of 22251637 in words is "twenty-two million, two hundred fifty-one thousand, six hundred thirty-seven".