22013539 has 2 divisors, whose sum is σ = 22013540. Its totient is φ = 22013538.

The previous prime is 22013491. The next prime is 22013561. The reversal of 22013539 is 93531022.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22013539 - 2¹⁵ = 21980771 is a prime.

It is not a weakly prime, because it can be changed into another prime (22013239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11006769 + 11006770.

It is an arithmetic number, because the mean of its divisors is an integer number (11006770).

Almost surely, 2^22013539 is an apocalyptic number.

22013539 is a deficient number, since it is larger than the sum of its proper divisors (1).

22013539 is an equidigital number, since it uses as much as digits as its factorization.

22013539 is an odious number, because the sum of its binary digits is odd.

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

The square root of 22013539 is about 4691.8588000919. The cubic root of 22013539 is about 280.2614012942.

The spelling of 22013539 in words is "twenty-two million, thirteen thousand, five hundred thirty-nine".