1311252236513 has 4 divisors (see below), whose sum is σ = 1311954569520. Its totient is φ = 1310549903508.

The previous prime is 1311252236429. The next prime is 1311252236519. The reversal of 1311252236513 is 3156322521131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1311252236513 - 2⁸ = 1311252236257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311252236519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351163703 + ... + 351167436.

It is an arithmetic number, because the mean of its divisors is an integer number (327988642380).

Almost surely, 2^{1311252236513} is an apocalyptic number.

It is an amenable number.

1311252236513 is a deficient number, since it is larger than the sum of its proper divisors (702333007).

1311252236513 is an equidigital number, since it uses as much as digits as its factorization.

1311252236513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702333006.

The product of its digits is 32400, while the sum is 35.

Adding to 1311252236513 its reverse (3156322521131), we get a palindrome (4467574757644).

The spelling of 1311252236513 in words is "one trillion, three hundred eleven billion, two hundred fifty-two million, two hundred thirty-six thousand, five hundred thirteen".