22000981 has 4 divisors (see below), whose sum is σ = 22010464. Its totient is φ = 21991500.

The previous prime is 22000963. The next prime is 22001033. The reversal of 22000981 is 18900022.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22000981 - 2²³ = 13612373 is a prime.

It is a super-2 number, since 2×22000981² = 968086329924722, 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 (22000921) 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, 1336 + ... + 6766.

It is an arithmetic number, because the mean of its divisors is an integer number (5502616).

Almost surely, 2^22000981 is an apocalyptic number.

It is an amenable number.

22000981 is a deficient number, since it is larger than the sum of its proper divisors (9483).

22000981 is an equidigital number, since it uses as much as digits as its factorization.

22000981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9482.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 22000981 is about 4690.5203336091. The cubic root of 22000981 is about 280.2080978530.

The spelling of 22000981 in words is "twenty-two million, nine hundred eighty-one", and thus it is an aban number.