22608981 has 6 divisors (see below), whose sum is σ = 32657430. Its totient is φ = 15072648.

The previous prime is 22608959. The next prime is 22608991. The reversal of 22608981 is 18980622.

It can be written as a sum of positive squares in only one way, i.e., 16892100 + 5716881 = 4110^2 + 2391^2 .

It is not a de Polignac number, because 22608981 - 2⁷ = 22608853 is a prime.

It is a super-2 number, since 2×22608981² = 1022332043716722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22608991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1256046 + ... + 1256063.

It is an arithmetic number, because the mean of its divisors is an integer number (5442905).

Almost surely, 2^22608981 is an apocalyptic number.

It is an amenable number.

22608981 is a deficient number, since it is larger than the sum of its proper divisors (10048449).

22608981 is a wasteful number, since it uses less digits than its factorization.

22608981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512115 (or 2512112 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 22608981 is about 4754.8902195529. The cubic root of 22608981 is about 282.7658749445.

The spelling of 22608981 in words is "twenty-two million, six hundred eight thousand, nine hundred eighty-one".