222312257 has 2 divisors, whose sum is σ = 222312258. Its totient is φ = 222312256.

The previous prime is 222312221. The next prime is 222312271. The reversal of 222312257 is 752213222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172764736 + 49547521 = 13144^2 + 7039^2 .

It is a cyclic number.

It is not a de Polignac number, because 222312257 - 2⁸ = 222312001 is a prime.

It is a super-2 number, since 2×222312257² = 98845479224868098, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (222317257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111156128 + 111156129.

It is an arithmetic number, because the mean of its divisors is an integer number (111156129).

Almost surely, 2^222312257 is an apocalyptic number.

It is an amenable number.

222312257 is a deficient number, since it is larger than the sum of its proper divisors (1).

222312257 is an equidigital number, since it uses as much as digits as its factorization.

222312257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 26.

The square root of 222312257 is about 14910.1394024335. The cubic root of 222312257 is about 605.7886552567.

Adding to 222312257 its reverse (752213222), we get a palindrome (974525479).

The spelling of 222312257 in words is "two hundred twenty-two million, three hundred twelve thousand, two hundred fifty-seven".