22513765 has 12 divisors (see below), whose sum is σ = 28515564. Its totient is φ = 17061696.

The previous prime is 22513741. The next prime is 22513769. The reversal of 22513765 is 56731522.

It can be written as a sum of positive squares in 2 ways, for example, as 11957764 + 10556001 = 3458^2 + 3249^2 .

It is a de Polignac number, because none of the positive numbers 2^k-22513765 is a prime.

It is a super-2 number, since 2×22513765² = 1013739228950450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22513769) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4432 + ... + 8041.

It is an arithmetic number, because the mean of its divisors is an integer number (2376297).

Almost surely, 2^22513765 is an apocalyptic number.

It is an amenable number.

22513765 is a deficient number, since it is larger than the sum of its proper divisors (6001799).

22513765 is a wasteful number, since it uses less digits than its factorization.

22513765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12516 (or 12497 counting only the distinct ones).

The product of its digits is 12600, while the sum is 31.

The square root of 22513765 is about 4744.8672268041. The cubic root of 22513765 is about 282.3683674212.

The spelling of 22513765 in words is "twenty-two million, five hundred thirteen thousand, seven hundred sixty-five".