22441981 has 2 divisors, whose sum is σ = 22441982. Its totient is φ = 22441980.

The previous prime is 22441963. The next prime is 22441999. The reversal of 22441981 is 18914422.

It is a balanced prime because it is at equal distance from previous prime (22441963) and next prime (22441999).

It can be written as a sum of positive squares in only one way, i.e., 20839225 + 1602756 = 4565^2 + 1266^2 .

It is a cyclic number.

It is not a de Polignac number, because 22441981 - 2²¹ = 20344829 is a prime.

It is a super-2 number, since 2×22441981² = 1007285022408722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22441931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11220990 + 11220991.

It is an arithmetic number, because the mean of its divisors is an integer number (11220991).

Almost surely, 2^22441981 is an apocalyptic number.

It is an amenable number.

22441981 is a deficient number, since it is larger than the sum of its proper divisors (1).

22441981 is an equidigital number, since it uses as much as digits as its factorization.

22441981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 31.

The square root of 22441981 is about 4737.2968030302. The cubic root of 22441981 is about 282.0679421493.

It can be divided in two parts, 2244 and 1981, that added together give a square (4225 = 65²).

The spelling of 22441981 in words is "twenty-two million, four hundred forty-one thousand, nine hundred eighty-one".