222639281 has 2 divisors, whose sum is σ = 222639282. Its totient is φ = 222639280.

The previous prime is 222639257. The next prime is 222639299. The reversal of 222639281 is 182936222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155251600 + 67387681 = 12460^2 + 8209^2 .

It is a cyclic number.

It is not a de Polignac number, because 222639281 - 2⁶ = 222639217 is a prime.

It is a super-2 number, since 2×222639281² = 99136498888393922, which contains 22 as substring.

It is equal to p_12259925 and since 222639281 and 12259925 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (222639481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111319640 + 111319641.

It is an arithmetic number, because the mean of its divisors is an integer number (111319641).

Almost surely, 2^222639281 is an apocalyptic number.

It is an amenable number.

222639281 is a deficient number, since it is larger than the sum of its proper divisors (1).

222639281 is an equidigital number, since it uses as much as digits as its factorization.

222639281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 222639281 is about 14921.1018695001. The cubic root of 222639281 is about 606.0855505212.

The spelling of 222639281 in words is "two hundred twenty-two million, six hundred thirty-nine thousand, two hundred eighty-one".