22445991 has 20 divisors (see below), whose sum is σ = 33737704. Its totient is φ = 14871600.

The previous prime is 22445963. The next prime is 22445993. The reversal of 22445991 is 19954422.

22445991 is a `hidden beast` number, since 22 + 44 + 599 + 1 = 666.

It is not a de Polignac number, because 22445991 - 2¹¹ = 22443943 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 (22445993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13896 + ... + 15426.

Almost surely, 2^22445991 is an apocalyptic number.

22445991 is a deficient number, since it is larger than the sum of its proper divisors (11291713).

22445991 is a wasteful number, since it uses less digits than its factorization.

22445991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724 (or 1715 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 22445991 is about 4737.7200212761. The cubic root of 22445991 is about 282.0847413954.

It can be divided in two parts, 22445 and 991, that added together give a triangular number (23436 = T₂₁₆).

The spelling of 22445991 in words is "twenty-two million, four hundred forty-five thousand, nine hundred ninety-one".