319989913 has 4 divisors (see below), whose sum is σ = 320100660. Its totient is φ = 319879168.

The previous prime is 319989907. The next prime is 319989931.

319989913 is nontrivially palindromic in base 10.

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 87366409 + 232623504 = 9347^2 + 15252^2 .

It is a cyclic number.

It is not a de Polignac number, because 319989913 - 2⁹ = 319989401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (319981913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50920 + ... + 56857.

It is an arithmetic number, because the mean of its divisors is an integer number (80025165).

Almost surely, 2^319989913 is an apocalyptic number.

It is an amenable number.

319989913 is a deficient number, since it is larger than the sum of its proper divisors (110747).

319989913 is a wasteful number, since it uses less digits than its factorization.

319989913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110746.

The product of its digits is 472392, while the sum is 52.

The square root of 319989913 is about 17888.2618775553. The cubic root of 319989913 is about 683.9831917088.

The spelling of 319989913 in words is "three hundred nineteen million, nine hundred eighty-nine thousand, nine hundred thirteen".