22745581 has 4 divisors (see below), whose sum is σ = 23274592. Its totient is φ = 22216572.

The previous prime is 22745563. The next prime is 22745587. The reversal of 22745581 is 18554722.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 22745581 - 2⁵ = 22745549 is a prime.

It is a super-2 number, since 2×22745581² = 1034722910055122, 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 (22745587) 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, 264441 + ... + 264526.

It is an arithmetic number, because the mean of its divisors is an integer number (5818648).

Almost surely, 2^22745581 is an apocalyptic number.

It is an amenable number.

22745581 is a deficient number, since it is larger than the sum of its proper divisors (529011).

22745581 is an equidigital number, since it uses as much as digits as its factorization.

22745581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529010.

The product of its digits is 22400, while the sum is 34.

The square root of 22745581 is about 4769.2327475182. The cubic root of 22745581 is about 283.3342079173.

The spelling of 22745581 in words is "twenty-two million, seven hundred forty-five thousand, five hundred eighty-one".