313232221 has 2 divisors, whose sum is σ = 313232222. Its totient is φ = 313232220.

The previous prime is 313232203. The next prime is 313232237. The reversal of 313232221 is 122232313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213452100 + 99780121 = 14610^2 + 9989^2 .

It is a cyclic number.

It is not a de Polignac number, because 313232221 - 2⁵ = 313232189 is a prime.

It is a super-2 number, since 2×313232221² = 196228848545185682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313232261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156616110 + 156616111.

It is an arithmetic number, because the mean of its divisors is an integer number (156616111).

Almost surely, 2^313232221 is an apocalyptic number.

It is an amenable number.

313232221 is a deficient number, since it is larger than the sum of its proper divisors (1).

313232221 is an equidigital number, since it uses as much as digits as its factorization.

313232221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 19.

The square root of 313232221 is about 17698.3677495977. The cubic root of 313232221 is about 679.1340050151.

Adding to 313232221 its reverse (122232313), we get a palindrome (435464534).

It can be divided in two parts, 3132 and 32221, that added together give a palindrome (35353).

The spelling of 313232221 in words is "three hundred thirteen million, two hundred thirty-two thousand, two hundred twenty-one".