1311255313 has 4 divisors (see below), whose sum is σ = 1315889008. Its totient is φ = 1306621620.

The previous prime is 1311255259. The next prime is 1311255347. The reversal of 1311255313 is 3135521131.

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 1311255313 - 2²⁵ = 1277700881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311255383) 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, 2316423 + ... + 2316988.

It is an arithmetic number, because the mean of its divisors is an integer number (328972252).

Almost surely, 2^1311255313 is an apocalyptic number.

It is an amenable number.

1311255313 is a deficient number, since it is larger than the sum of its proper divisors (4633695).

1311255313 is an equidigital number, since it uses as much as digits as its factorization.

1311255313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4633694.

The product of its digits is 1350, while the sum is 25.

The square root of 1311255313 is about 36211.2594782341. The cubic root of 1311255313 is about 1094.5335719808.

Adding to 1311255313 its reverse (3135521131), we get a palindrome (4446776444).

The spelling of 1311255313 in words is "one billion, three hundred eleven million, two hundred fifty-five thousand, three hundred thirteen".