319430521 has 4 divisors (see below), whose sum is σ = 321574500. Its totient is φ = 317286544.

The previous prime is 319430519. The next prime is 319430539. The reversal of 319430521 is 125034913.

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 44036496 + 275394025 = 6636^2 + 16595^2 .

It is a cyclic number.

It is not a de Polignac number, because 319430521 - 2¹ = 319430519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 319430521.

It is not an unprimeable number, because it can be changed into a prime (319430581) 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, 1071766 + ... + 1072063.

It is an arithmetic number, because the mean of its divisors is an integer number (80393625).

Almost surely, 2^319430521 is an apocalyptic number.

It is an amenable number.

319430521 is a deficient number, since it is larger than the sum of its proper divisors (2143979).

319430521 is a wasteful number, since it uses less digits than its factorization.

319430521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143978.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 319430521 is about 17872.6193099948. The cubic root of 319430521 is about 683.5843896597.

The spelling of 319430521 in words is "three hundred nineteen million, four hundred thirty thousand, five hundred twenty-one".