313130261 has 2 divisors, whose sum is σ = 313130262. Its totient is φ = 313130260.

The previous prime is 313130239. The next prime is 313130267. The reversal of 313130261 is 162031313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244140625 + 68989636 = 15625^2 + 8306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313130261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313130267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156565130 + 156565131.

It is an arithmetic number, because the mean of its divisors is an integer number (156565131).

Almost surely, 2^313130261 is an apocalyptic number.

It is an amenable number.

313130261 is a deficient number, since it is larger than the sum of its proper divisors (1).

313130261 is an equidigital number, since it uses as much as digits as its factorization.

313130261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 313130261 is about 17695.4870235323. The cubic root of 313130261 is about 679.0603088741.

Adding to 313130261 its reverse (162031313), we get a palindrome (475161574).

The spelling of 313130261 in words is "three hundred thirteen million, one hundred thirty thousand, two hundred sixty-one".