22513729 has 16 divisors (see below), whose sum is σ = 27381888. Its totient is φ = 18070272.

The previous prime is 22513721. The next prime is 22513741. The reversal of 22513729 is 92731522.

It is a cyclic number.

It is not a de Polignac number, because 22513729 - 2³ = 22513721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22513729.

It is not an unprimeable number, because it can be changed into a prime (22513721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32622 + ... + 33304.

It is an arithmetic number, because the mean of its divisors is an integer number (1711368).

Almost surely, 2^22513729 is an apocalyptic number.

It is an amenable number.

22513729 is a deficient number, since it is larger than the sum of its proper divisors (4868159).

22513729 is a wasteful number, since it uses less digits than its factorization.

22513729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984.

The product of its digits is 7560, while the sum is 31.

The square root of 22513729 is about 4744.8634332297. The cubic root of 22513729 is about 282.3682169168.

The spelling of 22513729 in words is "twenty-two million, five hundred thirteen thousand, seven hundred twenty-nine".