22543891 has 6 divisors (see below), whose sum is σ = 23108876. Its totient is φ = 21992400.

The previous prime is 22543889. The next prime is 22543901. The reversal of 22543891 is 19834522.

It is not a de Polignac number, because 22543891 - 2¹ = 22543889 is a prime.

It is a super-3 number, since 3×22543891³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22543811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5025 + ... + 8386.

Almost surely, 2^22543891 is an apocalyptic number.

22543891 is a deficient number, since it is larger than the sum of its proper divisors (564985).

22543891 is an equidigital number, since it uses as much as digits as its factorization.

22543891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13493 (or 13452 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 22543891 is about 4748.0407538268. The cubic root of 22543891 is about 282.4942583739.

The spelling of 22543891 in words is "twenty-two million, five hundred forty-three thousand, eight hundred ninety-one".