1313220637 has 2 divisors, whose sum is σ = 1313220638. Its totient is φ = 1313220636.

The previous prime is 1313220619. The next prime is 1313220647. The reversal of 1313220637 is 7360223131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1228782916 + 84437721 = 35054^2 + 9189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1313220637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313220647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656610318 + 656610319.

It is an arithmetic number, because the mean of its divisors is an integer number (656610319).

Almost surely, 2^1313220637 is an apocalyptic number.

It is an amenable number.

1313220637 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313220637 is an equidigital number, since it uses as much as digits as its factorization.

1313220637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 1313220637 is about 36238.3862361447. The cubic root of 1313220637 is about 1095.0801320256.

Adding to 1313220637 its reverse (7360223131), we get a palindrome (8673443768).

The spelling of 1313220637 in words is "one billion, three hundred thirteen million, two hundred twenty thousand, six hundred thirty-seven".