313440013 has 4 divisors (see below), whose sum is σ = 314206780. Its totient is φ = 312673248.

The previous prime is 313439989. The next prime is 313440031. The reversal of 313440013 is 310044313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310044313 = 197 ⋅1573829.

It can be written as a sum of positive squares in 2 ways, for example, as 203148009 + 110292004 = 14253^2 + 10502^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313440013 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 (313440313) 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, 382770 + ... + 383587.

It is an arithmetic number, because the mean of its divisors is an integer number (78551695).

Almost surely, 2^313440013 is an apocalyptic number.

It is an amenable number.

313440013 is a deficient number, since it is larger than the sum of its proper divisors (766767).

313440013 is an equidigital number, since it uses as much as digits as its factorization.

313440013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766766.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 313440013 is about 17704.2371482083. The cubic root of 313440013 is about 679.2841464651.

Adding to 313440013 its reverse (310044313), we get a palindrome (623484326).

The spelling of 313440013 in words is "three hundred thirteen million, four hundred forty thousand, thirteen".