313222561 has 2 divisors, whose sum is σ = 313222562. Its totient is φ = 313222560.

The previous prime is 313222541. The next prime is 313222573. The reversal of 313222561 is 165222313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246490000 + 66732561 = 15700^2 + 8169^2 .

It is an emirp because it is prime and its reverse (165222313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 313222561 - 2⁵ = 313222529 is a prime.

It is not a weakly prime, because it can be changed into another prime (313222531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156611280 + 156611281.

It is an arithmetic number, because the mean of its divisors is an integer number (156611281).

Almost surely, 2^313222561 is an apocalyptic number.

It is an amenable number.

313222561 is a deficient number, since it is larger than the sum of its proper divisors (1).

313222561 is an equidigital number, since it uses as much as digits as its factorization.

313222561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 25.

The square root of 313222561 is about 17698.0948409709. The cubic root of 313222561 is about 679.1270235048.

Adding to 313222561 its reverse (165222313), we get a palindrome (478444874).

The spelling of 313222561 in words is "three hundred thirteen million, two hundred twenty-two thousand, five hundred sixty-one".