22139525 has 24 divisors (see below), whose sum is σ = 29388744. Its totient is φ = 16486400.

The previous prime is 22139521. The next prime is 22139527. The reversal of 22139525 is 52593122.

It can be written as a sum of positive squares in 12 ways, for example, as 11498881 + 10640644 = 3391^2 + 3262^2 .

It is not a de Polignac number, because 22139525 - 2² = 22139521 is a prime.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22139521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47795 + ... + 48255.

It is an arithmetic number, because the mean of its divisors is an integer number (1224531).

Almost surely, 2^22139525 is an apocalyptic number.

22139525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

22139525 is the 3842-nd pentagonal number.

It is an amenable number.

22139525 is a deficient number, since it is larger than the sum of its proper divisors (7249219).

22139525 is a wasteful number, since it uses less digits than its factorization.

22139525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601 (or 596 counting only the distinct ones).

The product of its digits is 5400, while the sum is 29.

The square root of 22139525 is about 4705.2656673136. The cubic root of 22139525 is about 280.7950405709.

The spelling of 22139525 in words is "twenty-two million, one hundred thirty-nine thousand, five hundred twenty-five".