22513561 has 8 divisors (see below), whose sum is σ = 25839360. Its totient is φ = 19215168.

The previous prime is 22513511. The next prime is 22513567. The reversal of 22513561 is 16531522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22513561 - 2⁷ = 22513433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22513567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5056 + ... + 8401.

It is an arithmetic number, because the mean of its divisors is an integer number (3229920).

Almost surely, 2^22513561 is an apocalyptic number.

It is an amenable number.

22513561 is a deficient number, since it is larger than the sum of its proper divisors (3325799).

22513561 is a wasteful number, since it uses less digits than its factorization.

22513561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13703.

The product of its digits is 1800, while the sum is 25.

The square root of 22513561 is about 4744.8457298420. The cubic root of 22513561 is about 282.3675145605.

The spelling of 22513561 in words is "twenty-two million, five hundred thirteen thousand, five hundred sixty-one".