22450891 has 4 divisors (see below), whose sum is σ = 22522032. Its totient is φ = 22379752.

The previous prime is 22450889. The next prime is 22450907. The reversal of 22450891 is 19805422.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22450891 - 2¹ = 22450889 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22450861) 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 3 ways as a sum of consecutive naturals, for example, 35095 + ... + 35728.

It is an arithmetic number, because the mean of its divisors is an integer number (5630508).

Almost surely, 2^22450891 is an apocalyptic number.

22450891 is a deficient number, since it is larger than the sum of its proper divisors (71141).

22450891 is an equidigital number, since it uses as much as digits as its factorization.

22450891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71140.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 22450891 is about 4738.2371194359. The cubic root of 22450891 is about 282.1052664365.

It can be divided in two parts, 224 and 50891, that added together give a palindrome (51115).

The spelling of 22450891 in words is "twenty-two million, four hundred fifty thousand, eight hundred ninety-one".