313639 has 2 divisors, whose sum is σ = 313640. Its totient is φ = 313638.

The previous prime is 313637. The next prime is 313661. The reversal of 313639 is 936313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 313639 - 2¹ = 313637 is a prime.

Together with 313637, it forms a pair of twin primes.

It is a plaindrome in base 8.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156819 + 156820.

It is an arithmetic number, because the mean of its divisors is an integer number (156820).

2³¹³⁶³⁹ is an apocalyptic number.

313639 is a deficient number, since it is larger than the sum of its proper divisors (1).

313639 is an equidigital number, since it uses as much as digits as its factorization.

313639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458, while the sum is 25.

The square root of 313639 is about 560.0348203460. The cubic root of 313639 is about 67.9427863620.

The spelling of 313639 in words is "three hundred thirteen thousand, six hundred thirty-nine".