22554581 has 4 divisors (see below), whose sum is σ = 25776672. Its totient is φ = 19332492.

The previous prime is 22554569. The next prime is 22554583. The reversal of 22554581 is 18545522.

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 a de Polignac number, because none of the positive numbers 2^k-22554581 is a prime.

It is a super-2 number, since 2×22554581² = 1017418248171122, 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 (22554583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1611035 + ... + 1611048.

It is an arithmetic number, because the mean of its divisors is an integer number (6444168).

Almost surely, 2^22554581 is an apocalyptic number.

It is an amenable number.

22554581 is a deficient number, since it is larger than the sum of its proper divisors (3222091).

22554581 is an equidigital number, since it uses as much as digits as its factorization.

22554581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3222090.

The product of its digits is 16000, while the sum is 32.

The square root of 22554581 is about 4749.1663478973. The cubic root of 22554581 is about 282.5389029360.

The spelling of 22554581 in words is "twenty-two million, five hundred fifty-four thousand, five hundred eighty-one".