319743649 has 4 divisors (see below), whose sum is σ = 319933764. Its totient is φ = 319553536.

The previous prime is 319743643. The next prime is 319743659. The reversal of 319743649 is 946347913.

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 188870049 + 130873600 = 13743^2 + 11440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-319743649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 319743599 and 319743608.

It is not an unprimeable number, because it can be changed into a prime (319743643) 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, 92512 + ... + 95905.

It is an arithmetic number, because the mean of its divisors is an integer number (79983441).

Almost surely, 2^319743649 is an apocalyptic number.

It is an amenable number.

319743649 is a deficient number, since it is larger than the sum of its proper divisors (190115).

319743649 is a wasteful number, since it uses less digits than its factorization.

319743649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190114.

The product of its digits is 489888, while the sum is 46.

The square root of 319743649 is about 17881.3771561365. The cubic root of 319743649 is about 683.8076823579.

The spelling of 319743649 in words is "three hundred nineteen million, seven hundred forty-three thousand, six hundred forty-nine".