313440521 has 2 divisors, whose sum is σ = 313440522. Its totient is φ = 313440520.

The previous prime is 313440499. The next prime is 313440551. The reversal of 313440521 is 125044313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 307511296 + 5929225 = 17536^2 + 2435^2 .

It is an emirp because it is prime and its reverse (125044313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313440521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (313440551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156720260 + 156720261.

It is an arithmetic number, because the mean of its divisors is an integer number (156720261).

Almost surely, 2^313440521 is an apocalyptic number.

It is an amenable number.

313440521 is a deficient number, since it is larger than the sum of its proper divisors (1).

313440521 is an equidigital number, since it uses as much as digits as its factorization.

313440521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 313440521 is about 17704.2514950506. The cubic root of 313440521 is about 679.2845134425.

Adding to 313440521 its reverse (125044313), we get a palindrome (438484834).

The spelling of 313440521 in words is "three hundred thirteen million, four hundred forty thousand, five hundred twenty-one".