313513561 has 2 divisors, whose sum is σ = 313513562. Its totient is φ = 313513560.

The previous prime is 313513549. The next prime is 313513573. The reversal of 313513561 is 165315313.

It is a balanced prime because it is at equal distance from previous prime (313513549) and next prime (313513573).

It can be written as a sum of positive squares in only one way, i.e., 311169600 + 2343961 = 17640^2 + 1531^2 .

It is an emirp because it is prime and its reverse (165315313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 313513561 - 2⁹ = 313513049 is a prime.

It is not a weakly prime, because it can be changed into another prime (313513061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156756780 + 156756781.

It is an arithmetic number, because the mean of its divisors is an integer number (156756781).

Almost surely, 2^313513561 is an apocalyptic number.

It is an amenable number.

313513561 is a deficient number, since it is larger than the sum of its proper divisors (1).

313513561 is an equidigital number, since it uses as much as digits as its factorization.

313513561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4050, while the sum is 28.

The square root of 313513561 is about 17706.3141562551. The cubic root of 313513561 is about 679.3372731467.

Adding to 313513561 its reverse (165315313), we get a palindrome (478828874).

The spelling of 313513561 in words is "three hundred thirteen million, five hundred thirteen thousand, five hundred sixty-one".