313240561 has 2 divisors, whose sum is σ = 313240562. Its totient is φ = 313240560.

The previous prime is 313240559. The next prime is 313240579. The reversal of 313240561 is 165042313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245079025 + 68161536 = 15655^2 + 8256^2 .

It is an emirp because it is prime and its reverse (165042313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 313240561 - 2¹ = 313240559 is a prime.

Together with 313240559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (313240511) 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, 156620280 + 156620281.

It is an arithmetic number, because the mean of its divisors is an integer number (156620281).

Almost surely, 2^313240561 is an apocalyptic number.

It is an amenable number.

313240561 is a deficient number, since it is larger than the sum of its proper divisors (1).

313240561 is an equidigital number, since it uses as much as digits as its factorization.

313240561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 313240561 is about 17698.6033629775. The cubic root of 313240561 is about 679.1400324147.

Adding to 313240561 its reverse (165042313), we get a palindrome (478282874).

The spelling of 313240561 in words is "three hundred thirteen million, two hundred forty thousand, five hundred sixty-one".