1244377313 has 2 divisors, whose sum is σ = 1244377314. Its totient is φ = 1244377312.

The previous prime is 1244377289. The next prime is 1244377331. The reversal of 1244377313 is 3137734421.

Together with next prime (1244377331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855972049 + 388405264 = 29257^2 + 19708^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244377313 - 2⁶ = 1244377249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1244377333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622188656 + 622188657.

It is an arithmetic number, because the mean of its divisors is an integer number (622188657).

Almost surely, 2^1244377313 is an apocalyptic number.

It is an amenable number.

1244377313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244377313 is an equidigital number, since it uses as much as digits as its factorization.

1244377313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 35.

The square root of 1244377313 is about 35275.7326359071. The cubic root of 1244377313 is about 1075.5997556098.

The spelling of 1244377313 in words is "one billion, two hundred forty-four million, three hundred seventy-seven thousand, three hundred thirteen".