1312011245 has 4 divisors (see below), whose sum is σ = 1574413500. Its totient is φ = 1049608992.

The previous prime is 1312011221. The next prime is 1312011257. The reversal of 1312011245 is 5421102131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 672831721 + 639179524 = 25939^2 + 25282^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312011245 - 2²² = 1307816941 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131201120 + ... + 131201129.

It is an arithmetic number, because the mean of its divisors is an integer number (393603375).

Almost surely, 2^1312011245 is an apocalyptic number.

It is an amenable number.

1312011245 is a deficient number, since it is larger than the sum of its proper divisors (262402255).

1312011245 is an equidigital number, since it uses as much as digits as its factorization.

1312011245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262402254.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1312011245 is about 36221.6957775309. The cubic root of 1312011245 is about 1094.7438625828.

Adding to 1312011245 its reverse (5421102131), we get a palindrome (6733113376).

The spelling of 1312011245 in words is "one billion, three hundred twelve million, eleven thousand, two hundred forty-five".