319991 has 8 divisors (see below), whose sum is σ = 387360. Its totient is φ = 258048.

The previous prime is 319981. The next prime is 319993. The reversal of 319991 is 199913.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 319991 - 2⁶ = 319927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (319993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1226 + ... + 1463.

It is an arithmetic number, because the mean of its divisors is an integer number (48420).

2³¹⁹⁹⁹¹ is an apocalyptic number.

319991 is a deficient number, since it is larger than the sum of its proper divisors (67369).

319991 is a wasteful number, since it uses less digits than its factorization.

319991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2713.

The product of its digits is 2187, while the sum is 32.

The square root of 319991 is about 565.6774699420. The cubic root of 319991 is about 68.3983966201.

Adding to 319991 its sum of digits (32), we get a palindrome (320023).

The spelling of 319991 in words is "three hundred nineteen thousand, nine hundred ninety-one".