1313268191 has 4 divisors (see below), whose sum is σ = 1370366832. Its totient is φ = 1256169552.

The previous prime is 1313268179. The next prime is 1313268217. The reversal of 1313268191 is 1918623131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1313268191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313268091) 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, 28549286 + ... + 28549331.

It is an arithmetic number, because the mean of its divisors is an integer number (342591708).

Almost surely, 2^1313268191 is an apocalyptic number.

1313268191 is a deficient number, since it is larger than the sum of its proper divisors (57098641).

1313268191 is an equidigital number, since it uses as much as digits as its factorization.

1313268191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57098640.

The product of its digits is 7776, while the sum is 35.

The square root of 1313268191 is about 36239.0423576562. The cubic root of 1313268191 is about 1095.0933501172.

The spelling of 1313268191 in words is "one billion, three hundred thirteen million, two hundred sixty-eight thousand, one hundred ninety-one".