313978645 has 4 divisors (see below), whose sum is σ = 376774380. Its totient is φ = 251182912.

The previous prime is 313978607. The next prime is 313978649. The reversal of 313978645 is 546879313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79245604 + 234733041 = 8902^2 + 15321^2 .

It is a cyclic number.

It is not a de Polignac number, because 313978645 - 2⁷ = 313978517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 313978595 and 313978604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313978649) 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 in 3 ways as a sum of consecutive naturals, for example, 31397860 + ... + 31397869.

It is an arithmetic number, because the mean of its divisors is an integer number (94193595).

Almost surely, 2^313978645 is an apocalyptic number.

It is an amenable number.

313978645 is a deficient number, since it is larger than the sum of its proper divisors (62795735).

313978645 is an equidigital number, since it uses as much as digits as its factorization.

313978645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62795734.

The product of its digits is 544320, while the sum is 46.

The square root of 313978645 is about 17719.4425702391. The cubic root of 313978645 is about 679.6730298007.

The spelling of 313978645 in words is "three hundred thirteen million, nine hundred seventy-eight thousand, six hundred forty-five".