222086581 has 2 divisors, whose sum is σ = 222086582. Its totient is φ = 222086580.

The previous prime is 222086569. The next prime is 222086603. The reversal of 222086581 is 185680222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159138225 + 62948356 = 12615^2 + 7934^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222086581 is a prime.

It is a super-2 number, since 2×222086581² = 98644898920539122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222086531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111043290 + 111043291.

It is an arithmetic number, because the mean of its divisors is an integer number (111043291).

Almost surely, 2^222086581 is an apocalyptic number.

It is an amenable number.

222086581 is a deficient number, since it is larger than the sum of its proper divisors (1).

222086581 is an equidigital number, since it uses as much as digits as its factorization.

222086581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 222086581 is about 14902.5696106410. The cubic root of 222086581 is about 605.5836009655.

The spelling of 222086581 in words is "two hundred twenty-two million, eighty-six thousand, five hundred eighty-one".