313224531397721 has 2 divisors, whose sum is σ = 313224531397722. Its totient is φ = 313224531397720.

The previous prime is 313224531397643. The next prime is 313224531397759. The reversal of 313224531397721 is 127793135422313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 298555547137600 + 14668984260121 = 17278760^2 + 3830011^2 .

It is a cyclic number.

It is not a de Polignac number, because 313224531397721 - 2³⁰ = 313223457655897 is a prime.

It is not a weakly prime, because it can be changed into another prime (313224531397121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156612265698860 + 156612265698861.

It is an arithmetic number, because the mean of its divisors is an integer number (156612265698861).

Almost surely, 2^{313224531397721} is an apocalyptic number.

It is an amenable number.

313224531397721 is a deficient number, since it is larger than the sum of its proper divisors (1).

313224531397721 is an equidigital number, since it uses as much as digits as its factorization.

313224531397721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5715360, while the sum is 53.

The spelling of 313224531397721 in words is "three hundred thirteen trillion, two hundred twenty-four billion, five hundred thirty-one million, three hundred ninety-seven thousand, seven hundred twenty-one".