1311307203 has 4 divisors (see below), whose sum is σ = 1748409608. Its totient is φ = 874204800.

The previous prime is 1311307187. The next prime is 1311307229. The reversal of 1311307203 is 3027031131.

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

It is not a de Polignac number, because 1311307203 - 2⁴ = 1311307187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311307203.

It is not an unprimeable number, because it can be changed into a prime (1311307603) 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, 218551198 + ... + 218551203.

It is an arithmetic number, because the mean of its divisors is an integer number (437102402).

Almost surely, 2^1311307203 is an apocalyptic number.

1311307203 is a deficient number, since it is larger than the sum of its proper divisors (437102405).

1311307203 is an equidigital number, since it uses as much as digits as its factorization.

1311307203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437102404.

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 1311307203 is about 36211.9759609994. The cubic root of 1311307203 is about 1094.5480096975.

Adding to 1311307203 its reverse (3027031131), we get a palindrome (4338338334).

The spelling of 1311307203 in words is "one billion, three hundred eleven million, three hundred seven thousand, two hundred three".