22154581 has 4 divisors (see below), whose sum is σ = 22277164. Its totient is φ = 22032000.

The previous prime is 22154567. The next prime is 22154591. The reversal of 22154581 is 18545122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 680625 + 21473956 = 825^2 + 4634^2 .

It is a cyclic number.

It is not a de Polignac number, because 22154581 - 2⁵ = 22154549 is a prime.

It is a super-2 number, since 2×22154581² = 981650918571122, 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 (22154501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61020 + ... + 61381.

It is an arithmetic number, because the mean of its divisors is an integer number (5569291).

Almost surely, 2^22154581 is an apocalyptic number.

It is an amenable number.

22154581 is a deficient number, since it is larger than the sum of its proper divisors (122583).

22154581 is a wasteful number, since it uses less digits than its factorization.

22154581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122582.

The product of its digits is 3200, while the sum is 28.

The square root of 22154581 is about 4706.8653050624. The cubic root of 22154581 is about 280.8586777711.

The spelling of 22154581 in words is "twenty-two million, one hundred fifty-four thousand, five hundred eighty-one".