22542181 has 8 divisors (see below), whose sum is σ = 23068760. Its totient is φ = 22021632.

The previous prime is 22542173. The next prime is 22542199. The reversal of 22542181 is 18124522.

It can be written as a sum of positive squares in 4 ways, for example, as 4691556 + 17850625 = 2166^2 + 4225^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22542181 - 2³ = 22542173 is a prime.

It is a super-2 number, since 2×22542181² = 1016299848473522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22542581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6541 + ... + 9373.

It is an arithmetic number, because the mean of its divisors is an integer number (2883595).

Almost surely, 2^22542181 is an apocalyptic number.

It is an amenable number.

22542181 is a deficient number, since it is larger than the sum of its proper divisors (526579).

22542181 is a wasteful number, since it uses less digits than its factorization.

22542181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3015.

The product of its digits is 1280, while the sum is 25.

The square root of 22542181 is about 4747.8606761361. The cubic root of 22542181 is about 282.4871156052.

The spelling of 22542181 in words is "twenty-two million, five hundred forty-two thousand, one hundred eighty-one".