22752509 has 4 divisors (see below), whose sum is σ = 24502716. Its totient is φ = 21002304.

The previous prime is 22752491. The next prime is 22752517. The reversal of 22752509 is 90525722.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1315609 + 21436900 = 1147^2 + 4630^2 .

It is a cyclic number.

It is not a de Polignac number, because 22752509 - 2²⁴ = 5975293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22752599) 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, 875084 + ... + 875109.

It is an arithmetic number, because the mean of its divisors is an integer number (6125679).

Almost surely, 2^22752509 is an apocalyptic number.

It is an amenable number.

22752509 is a deficient number, since it is larger than the sum of its proper divisors (1750207).

22752509 is a wasteful number, since it uses less digits than its factorization.

22752509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750206.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 22752509 is about 4769.9590144990. The cubic root of 22752509 is about 283.3629716016.

The spelling of 22752509 in words is "twenty-two million, seven hundred fifty-two thousand, five hundred nine".