313191397 has 2 divisors, whose sum is σ = 313191398. Its totient is φ = 313191396.

The previous prime is 313191353. The next prime is 313191427. The reversal of 313191397 is 793191313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240839361 + 72352036 = 15519^2 + 8506^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313191397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313195397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156595698 + 156595699.

It is an arithmetic number, because the mean of its divisors is an integer number (156595699).

Almost surely, 2^313191397 is an apocalyptic number.

It is an amenable number.

313191397 is a deficient number, since it is larger than the sum of its proper divisors (1).

313191397 is an equidigital number, since it uses as much as digits as its factorization.

313191397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15309, while the sum is 37.

The square root of 313191397 is about 17697.2143853206. The cubic root of 313191397 is about 679.1044995669.

The spelling of 313191397 in words is "three hundred thirteen million, one hundred ninety-one thousand, three hundred ninety-seven".