313287389 has 4 divisors (see below), whose sum is σ = 314076924. Its totient is φ = 312497856.

The previous prime is 313287361. The next prime is 313287391. The reversal of 313287389 is 983782313.

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 78676900 + 234610489 = 8870^2 + 15317^2 .

It is a cyclic number.

It is not a de Polignac number, because 313287389 - 2⁸ = 313287133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313287589) 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, 394172 + ... + 394965.

It is an arithmetic number, because the mean of its divisors is an integer number (78519231).

Almost surely, 2^313287389 is an apocalyptic number.

It is an amenable number.

313287389 is a deficient number, since it is larger than the sum of its proper divisors (789535).

313287389 is an equidigital number, since it uses as much as digits as its factorization.

313287389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789534.

The product of its digits is 217728, while the sum is 44.

The square root of 313287389 is about 17699.9262427842. The cubic root of 313287389 is about 679.1738734821.

The spelling of 313287389 in words is "three hundred thirteen million, two hundred eighty-seven thousand, three hundred eighty-nine".