22513513 has 4 divisors (see below), whose sum is σ = 24560208. Its totient is φ = 20466820.

The previous prime is 22513511. The next prime is 22513567. The reversal of 22513513 is 31531522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22513513 - 2¹ = 22513511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22513511) 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, 1023331 + ... + 1023352.

It is an arithmetic number, because the mean of its divisors is an integer number (6140052).

Almost surely, 2^22513513 is an apocalyptic number.

It is an amenable number.

22513513 is a deficient number, since it is larger than the sum of its proper divisors (2046695).

22513513 is a wasteful number, since it uses less digits than its factorization.

22513513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046694.

The product of its digits is 900, while the sum is 22.

The square root of 22513513 is about 4744.8406717191. The cubic root of 22513513 is about 282.3673138866.

Subtracting 22513513 from its reverse (31531522), we obtain a square (9018009 = 3003²).

The spelling of 22513513 in words is "twenty-two million, five hundred thirteen thousand, five hundred thirteen".