222555581 has 2 divisors, whose sum is σ = 222555582. Its totient is φ = 222555580.

The previous prime is 222555559. The next prime is 222555617. The reversal of 222555581 is 185555222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197655481 + 24900100 = 14059^2 + 4990^2 .

It is a cyclic number.

It is not a de Polignac number, because 222555581 - 2¹⁸ = 222293437 is a prime.

It is a super-2 number, since 2×222555581² = 99061973268495122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222555881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111277790 + 111277791.

It is an arithmetic number, because the mean of its divisors is an integer number (111277791).

Almost surely, 2^222555581 is an apocalyptic number.

It is an amenable number.

222555581 is a deficient number, since it is larger than the sum of its proper divisors (1).

222555581 is an equidigital number, since it uses as much as digits as its factorization.

222555581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40000, while the sum is 35.

The square root of 222555581 is about 14918.2968531934. The cubic root of 222555581 is about 606.0095895036.

The spelling of 222555581 in words is "two hundred twenty-two million, five hundred fifty-five thousand, five hundred eighty-one".