313643641 has 2 divisors, whose sum is σ = 313643642. Its totient is φ = 313643640.

The previous prime is 313643609. The next prime is 313643651. The reversal of 313643641 is 146346313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207965241 + 105678400 = 14421^2 + 10280^2 .

It is an emirp because it is prime and its reverse (146346313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 313643641 - 2⁵ = 313643609 is a prime.

It is not a weakly prime, because it can be changed into another prime (313643651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156821820 + 156821821.

It is an arithmetic number, because the mean of its divisors is an integer number (156821821).

Almost surely, 2^313643641 is an apocalyptic number.

It is an amenable number.

313643641 is a deficient number, since it is larger than the sum of its proper divisors (1).

313643641 is an equidigital number, since it uses as much as digits as its factorization.

313643641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 31.

The square root of 313643641 is about 17709.9870412149. The cubic root of 313643641 is about 679.4312148286.

Adding to 313643641 its reverse (146346313), we get a palindrome (459989954).

The spelling of 313643641 in words is "three hundred thirteen million, six hundred forty-three thousand, six hundred forty-one".