313218791 has 2 divisors, whose sum is σ = 313218792. Its totient is φ = 313218790.

The previous prime is 313218779. The next prime is 313218793. The reversal of 313218791 is 197812313.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313218791 is a prime.

It is a super-2 number, since 2×313218791² = 196212022071003362, which contains 22 as substring.

Together with 313218793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313218793) 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, 156609395 + 156609396.

It is an arithmetic number, because the mean of its divisors is an integer number (156609396).

Almost surely, 2^313218791 is an apocalyptic number.

313218791 is a deficient number, since it is larger than the sum of its proper divisors (1).

313218791 is an equidigital number, since it uses as much as digits as its factorization.

313218791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 35.

The square root of 313218791 is about 17697.9883320111. The cubic root of 313218791 is about 679.1242987977.

The spelling of 313218791 in words is "three hundred thirteen million, two hundred eighteen thousand, seven hundred ninety-one".