313978517 has 2 divisors, whose sum is σ = 313978518. Its totient is φ = 313978516.

The previous prime is 313978501. The next prime is 313978531. The reversal of 313978517 is 715879313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 313785796 + 192721 = 17714^2 + 439^2 .

It is an emirp because it is prime and its reverse (715879313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 313978517 - 2⁴ = 313978501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313974517) 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, 156989258 + 156989259.

It is an arithmetic number, because the mean of its divisors is an integer number (156989259).

Almost surely, 2^313978517 is an apocalyptic number.

It is an amenable number.

313978517 is a deficient number, since it is larger than the sum of its proper divisors (1).

313978517 is an equidigital number, since it uses as much as digits as its factorization.

313978517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 44.

The square root of 313978517 is about 17719.4389583869. The cubic root of 313978517 is about 679.6729374397.

The spelling of 313978517 in words is "three hundred thirteen million, nine hundred seventy-eight thousand, five hundred seventeen".