22539013 has 4 divisors (see below), whose sum is σ = 25758880. Its totient is φ = 19319148.

The previous prime is 22538987. The next prime is 22539067. The reversal of 22539013 is 31093522.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31093522 = 2 ⋅15546761.

It is a cyclic number.

It is not a de Polignac number, because 22539013 - 2¹⁷ = 22407941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22539313) 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, 1609923 + ... + 1609936.

It is an arithmetic number, because the mean of its divisors is an integer number (6439720).

Almost surely, 2^22539013 is an apocalyptic number.

It is an amenable number.

22539013 is a deficient number, since it is larger than the sum of its proper divisors (3219867).

22539013 is an equidigital number, since it uses as much as digits as its factorization.

22539013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3219866.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 22539013 is about 4747.5270404706. The cubic root of 22539013 is about 282.4738817318.

The spelling of 22539013 in words is "twenty-two million, five hundred thirty-nine thousand, thirteen".