1312313237 has 2 divisors, whose sum is σ = 1312313238. Its totient is φ = 1312313236.

The previous prime is 1312313209. The next prime is 1312313243. The reversal of 1312313237 is 7323132131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1302415921 + 9897316 = 36089^2 + 3146^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312313237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312313257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656156618 + 656156619.

It is an arithmetic number, because the mean of its divisors is an integer number (656156619).

Almost surely, 2^1312313237 is an apocalyptic number.

It is an amenable number.

1312313237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312313237 is an equidigital number, since it uses as much as digits as its factorization.

1312313237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 26.

The square root of 1312313237 is about 36225.8641994915. The cubic root of 1312313237 is about 1094.8278503096.

Adding to 1312313237 its reverse (7323132131), we get a palindrome (8635445368).

The spelling of 1312313237 in words is "one billion, three hundred twelve million, three hundred thirteen thousand, two hundred thirty-seven".