313978649 has 2 divisors, whose sum is σ = 313978650. Its totient is φ = 313978648.

The previous prime is 313978607. The next prime is 313978657. The reversal of 313978649 is 946879313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 281568400 + 32410249 = 16780^2 + 5693^2 .

It is an emirp because it is prime and its reverse (946879313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 313978649 - 2¹⁶ = 313913113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 313978597 and 313978606.

It is not a weakly prime, because it can be changed into another prime (313978349) 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, 156989324 + 156989325.

It is an arithmetic number, because the mean of its divisors is an integer number (156989325).

Almost surely, 2^313978649 is an apocalyptic number.

It is an amenable number.

313978649 is a deficient number, since it is larger than the sum of its proper divisors (1).

313978649 is an equidigital number, since it uses as much as digits as its factorization.

313978649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 50.

The square root of 313978649 is about 17719.4426831094. The cubic root of 313978649 is about 679.6730326870.

The spelling of 313978649 in words is "three hundred thirteen million, nine hundred seventy-eight thousand, six hundred forty-nine".