222231397 has 2 divisors, whose sum is σ = 222231398. Its totient is φ = 222231396.

The previous prime is 222231389. The next prime is 222231433. The reversal of 222231397 is 793132222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221592996 + 638401 = 14886^2 + 799^2 .

It is a cyclic number.

It is not a de Polignac number, because 222231397 - 2³ = 222231389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222231307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111115698 + 111115699.

It is an arithmetic number, because the mean of its divisors is an integer number (111115699).

Almost surely, 2^222231397 is an apocalyptic number.

It is an amenable number.

222231397 is a deficient number, since it is larger than the sum of its proper divisors (1).

222231397 is an equidigital number, since it uses as much as digits as its factorization.

222231397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 31.

The square root of 222231397 is about 14907.4275782242. The cubic root of 222231397 is about 605.7152000015.

The spelling of 222231397 in words is "two hundred twenty-two million, two hundred thirty-one thousand, three hundred ninety-seven".