22528981 has 4 divisors (see below), whose sum is σ = 22691200. Its totient is φ = 22366764.

The previous prime is 22528963. The next prime is 22528991. The reversal of 22528981 is 18982522.

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 22528981 - 2¹³ = 22520789 is a prime.

It is a super-2 number, since 2×22528981² = 1015109969796722, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 22528981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22528931) 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, 80901 + ... + 81178.

It is an arithmetic number, because the mean of its divisors is an integer number (5672800).

Almost surely, 2^22528981 is an apocalyptic number.

It is an amenable number.

22528981 is a deficient number, since it is larger than the sum of its proper divisors (162219).

22528981 is a wasteful number, since it uses less digits than its factorization.

22528981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162218.

The product of its digits is 23040, while the sum is 37.

The square root of 22528981 is about 4746.4703728139. The cubic root of 22528981 is about 282.4319662833.

The spelling of 22528981 in words is "twenty-two million, five hundred twenty-eight thousand, nine hundred eighty-one".