222409981 has 2 divisors, whose sum is σ = 222409982. Its totient is φ = 222409980.

The previous prime is 222409951. The next prime is 222410057. The reversal of 222409981 is 189904222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171872100 + 50537881 = 13110^2 + 7109^2 .

It is a cyclic number.

It is not a de Polignac number, because 222409981 - 2⁵ = 222409949 is a prime.

It is a super-2 number, since 2×222409981² = 98932399296840722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 222409981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222409951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111204990 + 111204991.

It is an arithmetic number, because the mean of its divisors is an integer number (111204991).

Almost surely, 2^222409981 is an apocalyptic number.

It is an amenable number.

222409981 is a deficient number, since it is larger than the sum of its proper divisors (1).

222409981 is an equidigital number, since it uses as much as digits as its factorization.

222409981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 222409981 is about 14913.4161411797. The cubic root of 222409981 is about 605.8774064260.

The spelling of 222409981 in words is "two hundred twenty-two million, four hundred nine thousand, nine hundred eighty-one".