22781613 has 4 divisors (see below), whose sum is σ = 30375488. Its totient is φ = 15187740.

The previous prime is 22781599. The next prime is 22781651. The reversal of 22781613 is 31618722.

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 22781613 - 2¹⁴ = 22765229 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 (22781663) 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, 3796933 + ... + 3796938.

It is an arithmetic number, because the mean of its divisors is an integer number (7593872).

Almost surely, 2^22781613 is an apocalyptic number.

It is an amenable number.

22781613 is a deficient number, since it is larger than the sum of its proper divisors (7593875).

22781613 is an equidigital number, since it uses as much as digits as its factorization.

22781613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7593874.

The product of its digits is 4032, while the sum is 30.

The square root of 22781613 is about 4773.0087994891. The cubic root of 22781613 is about 283.4837419018.

The spelling of 22781613 in words is "twenty-two million, seven hundred eighty-one thousand, six hundred thirteen".