313242509 has 2 divisors, whose sum is σ = 313242510. Its totient is φ = 313242508.

The previous prime is 313242499. The next prime is 313242541. The reversal of 313242509 is 905242313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247275625 + 65966884 = 15725^2 + 8122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313242509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313245509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156621254 + 156621255.

It is an arithmetic number, because the mean of its divisors is an integer number (156621255).

Almost surely, 2^313242509 is an apocalyptic number.

It is an amenable number.

313242509 is a deficient number, since it is larger than the sum of its proper divisors (1).

313242509 is an equidigital number, since it uses as much as digits as its factorization.

313242509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 313242509 is about 17698.6583954830. The cubic root of 313242509 is about 679.1414402380.

It can be divided in two parts, 31324 and 2509, that added together give a palindrome (33833).

The spelling of 313242509 in words is "three hundred thirteen million, two hundred forty-two thousand, five hundred nine".