626431313 has 4 divisors (see below), whose sum is σ = 630635700. Its totient is φ = 622226928.

The previous prime is 626431301. The next prime is 626431319. The reversal of 626431313 is 313134626.

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 343249729 + 283181584 = 18527^2 + 16828^2 .

It is a cyclic number.

It is not a de Polignac number, because 626431313 - 2¹⁶ = 626365777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (626431319) 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, 2101970 + ... + 2102267.

It is an arithmetic number, because the mean of its divisors is an integer number (157658925).

Almost surely, 2^626431313 is an apocalyptic number.

It is an amenable number.

626431313 is a deficient number, since it is larger than the sum of its proper divisors (4204387).

626431313 is a wasteful number, since it uses less digits than its factorization.

626431313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4204386.

The product of its digits is 7776, while the sum is 29.

The square root of 626431313 is about 25028.6098894845. The cubic root of 626431313 is about 855.6401452922.

Adding to 626431313 its reverse (313134626), we get a palindrome (939565939).

The spelling of 626431313 in words is "six hundred twenty-six million, four hundred thirty-one thousand, three hundred thirteen".