1231245317 has 2 divisors, whose sum is σ = 1231245318. Its totient is φ = 1231245316.

The previous prime is 1231245311. The next prime is 1231245331. The reversal of 1231245317 is 7135421321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1231237921 + 7396 = 35089^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231245317 - 2²⁶ = 1164136453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231245317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231245311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615622658 + 615622659.

It is an arithmetic number, because the mean of its divisors is an integer number (615622659).

Almost surely, 2^1231245317 is an apocalyptic number.

It is an amenable number.

1231245317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231245317 is an equidigital number, since it uses as much as digits as its factorization.

1231245317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 29.

The square root of 1231245317 is about 35089.1053889950. The cubic root of 1231245317 is about 1071.8027423143.

Adding to 1231245317 its reverse (7135421321), we get a palindrome (8366666638).

The spelling of 1231245317 in words is "one billion, two hundred thirty-one million, two hundred forty-five thousand, three hundred seventeen".