22645981 has 4 divisors (see below), whose sum is σ = 23198364. Its totient is φ = 22093600.

The previous prime is 22645979. The next prime is 22646021. The reversal of 22645981 is 18954622.

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 320356 + 22325625 = 566^2 + 4725^2 .

It is a cyclic number.

It is not a de Polignac number, because 22645981 - 2¹ = 22645979 is a prime.

It is a super-2 number, since 2×22645981² = 1025680910904722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22645981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22645901) 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, 276130 + ... + 276211.

It is an arithmetic number, because the mean of its divisors is an integer number (5799591).

Almost surely, 2^22645981 is an apocalyptic number.

It is an amenable number.

22645981 is a deficient number, since it is larger than the sum of its proper divisors (552383).

22645981 is an equidigital number, since it uses as much as digits as its factorization.

22645981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552382.

The product of its digits is 34560, while the sum is 37.

The square root of 22645981 is about 4758.7793602982. The cubic root of 22645981 is about 282.9200413395.

The spelling of 22645981 in words is "twenty-two million, six hundred forty-five thousand, nine hundred eighty-one".