22539481 has 2 divisors, whose sum is σ = 22539482. Its totient is φ = 22539480.

The previous prime is 22539457. The next prime is 22539487. The reversal of 22539481 is 18493522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12673600 + 9865881 = 3560^2 + 3141^2 .

It is a cyclic number.

It is not a de Polignac number, because 22539481 - 2¹¹ = 22537433 is a prime.

It is a super-2 number, since 2×22539481² = 1016056407498722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22539487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11269740 + 11269741.

It is an arithmetic number, because the mean of its divisors is an integer number (11269741).

Almost surely, 2^22539481 is an apocalyptic number.

It is an amenable number.

22539481 is a deficient number, since it is larger than the sum of its proper divisors (1).

22539481 is an equidigital number, since it uses as much as digits as its factorization.

22539481 is an evil number, because the sum of its binary digits is even.

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

The square root of 22539481 is about 4747.5763290336. The cubic root of 22539481 is about 282.4758368139.

The spelling of 22539481 in words is "twenty-two million, five hundred thirty-nine thousand, four hundred eighty-one".