313999391 has 4 divisors (see below), whose sum is σ = 319146984. Its totient is φ = 308851800.

The previous prime is 313999369. The next prime is 313999393. The reversal of 313999391 is 193999313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193999313 = 2243 ⋅86491.

It is a cyclic number.

It is not a de Polignac number, because 313999391 - 2¹⁸ = 313737247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313999393) 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, 2573705 + ... + 2573826.

It is an arithmetic number, because the mean of its divisors is an integer number (79786746).

Almost surely, 2^313999391 is an apocalyptic number.

313999391 is a deficient number, since it is larger than the sum of its proper divisors (5147593).

313999391 is an equidigital number, since it uses as much as digits as its factorization.

313999391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5147592.

The product of its digits is 177147, while the sum is 47.

The square root of 313999391 is about 17720.0279627319. The cubic root of 313999391 is about 679.6879991692.

The spelling of 313999391 in words is "three hundred thirteen million, nine hundred ninety-nine thousand, three hundred ninety-one".