319333921 has 4 divisors (see below), whose sum is σ = 322263700. Its totient is φ = 316404144.

The previous prime is 319333919. The next prime is 319333943. The reversal of 319333921 is 129333913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129333913 = 1483 ⋅87211.

It can be written as a sum of positive squares in 2 ways, for example, as 263607696 + 55726225 = 16236^2 + 7465^2 .

It is a cyclic number.

It is not a de Polignac number, because 319333921 - 2¹ = 319333919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (319333981) 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, 1464726 + ... + 1464943.

It is an arithmetic number, because the mean of its divisors is an integer number (80565925).

Almost surely, 2^319333921 is an apocalyptic number.

It is an amenable number.

319333921 is a deficient number, since it is larger than the sum of its proper divisors (2929779).

319333921 is a wasteful number, since it uses less digits than its factorization.

319333921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2929778.

The product of its digits is 13122, while the sum is 34.

The square root of 319333921 is about 17869.9166478190. The cubic root of 319333921 is about 683.5154744023.

The spelling of 319333921 in words is "three hundred nineteen million, three hundred thirty-three thousand, nine hundred twenty-one".