222221497 has 2 divisors, whose sum is σ = 222221498. Its totient is φ = 222221496.

The previous prime is 222221491. The next prime is 222221537. The reversal of 222221497 is 794122222.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122301481 + 99920016 = 11059^2 + 9996^2 .

It is a cyclic number.

It is not a de Polignac number, because 222221497 - 2⁷ = 222221369 is a prime.

It is not a weakly prime, because it can be changed into another prime (222221491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111110748 + 111110749.

It is an arithmetic number, because the mean of its divisors is an integer number (111110749).

Almost surely, 2^222221497 is an apocalyptic number.

It is an amenable number.

222221497 is a deficient number, since it is larger than the sum of its proper divisors (1).

222221497 is an equidigital number, since it uses as much as digits as its factorization.

222221497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 222221497 is about 14907.0955252859. The cubic root of 222221497 is about 605.7062053685.

The spelling of 222221497 in words is "two hundred twenty-two million, two hundred twenty-one thousand, four hundred ninety-seven".