319881985 has 16 divisors (see below), whose sum is σ = 392018256. Its totient is φ = 250518528.

The previous prime is 319881943. The next prime is 319882001. The reversal of 319881985 is 589188913.

It can be written as a sum of positive squares in 8 ways, for example, as 35892081 + 283989904 = 5991^2 + 16852^2 .

It is a cyclic number.

It is not a de Polignac number, because 319881985 - 2⁷ = 319881857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46807 + ... + 53203.

It is an arithmetic number, because the mean of its divisors is an integer number (24501141).

Almost surely, 2^319881985 is an apocalyptic number.

It is an amenable number.

319881985 is a deficient number, since it is larger than the sum of its proper divisors (72136271).

319881985 is a wasteful number, since it uses less digits than its factorization.

319881985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6612.

The product of its digits is 622080, while the sum is 52.

The square root of 319881985 is about 17885.2448962825. The cubic root of 319881985 is about 683.9062838271.

The spelling of 319881985 in words is "three hundred nineteen million, eight hundred eighty-one thousand, nine hundred eighty-five".