22439509 has 2 divisors, whose sum is σ = 22439510. Its totient is φ = 22439508.

The previous prime is 22439497. The next prime is 22439519. The reversal of 22439509 is 90593422.

22439509 is nontrivially palindromic in base 4.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20052484 + 2387025 = 4478^2 + 1545^2 .

It is a cyclic number.

It is not a de Polignac number, because 22439509 - 2¹³ = 22431317 is a prime.

It is a super-2 number, since 2×22439509² = 1007063128322162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22439519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11219754 + 11219755.

It is an arithmetic number, because the mean of its divisors is an integer number (11219755).

Almost surely, 2^22439509 is an apocalyptic number.

It is an amenable number.

22439509 is a deficient number, since it is larger than the sum of its proper divisors (1).

22439509 is an equidigital number, since it uses as much as digits as its factorization.

22439509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 22439509 is about 4737.0358875567. The cubic root of 22439509 is about 282.0575851082.

The spelling of 22439509 in words is "twenty-two million, four hundred thirty-nine thousand, five hundred nine".