319456921 has 6 divisors (see below), whose sum is σ = 371613210. Its totient is φ = 273820176.

The previous prime is 319456919. The next prime is 319456967. The reversal of 319456921 is 129654913.

It can be written as a sum of positive squares in only one way, i.e., 318122896 + 1334025 = 17836^2 + 1155^2 .

It is not a de Polignac number, because 319456921 - 2¹ = 319456919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (319436921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3259716 + ... + 3259813.

It is an arithmetic number, because the mean of its divisors is an integer number (61935535).

Almost surely, 2^319456921 is an apocalyptic number.

It is an amenable number.

319456921 is a deficient number, since it is larger than the sum of its proper divisors (52156289).

319456921 is an equidigital number, since it uses as much as digits as its factorization.

319456921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6519543 (or 6519536 counting only the distinct ones).

The product of its digits is 58320, while the sum is 40.

The square root of 319456921 is about 17873.3578546394. The cubic root of 319456921 is about 683.6032212256.

The spelling of 319456921 in words is "three hundred nineteen million, four hundred fifty-six thousand, nine hundred twenty-one".