1311313203 has 6 divisors (see below), whose sum is σ = 1894119084. Its totient is φ = 874208796.

The previous prime is 1311313183. The next prime is 1311313229. The reversal of 1311313203 is 3023131131.

It is a happy number.

1311313203 is a `hidden beast` number, since 1 + 311 + 31 + 320 + 3 = 666.

It is not a de Polignac number, because 1311313203 - 2¹⁸ = 1311051059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311313243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72850725 + ... + 72850742.

It is an arithmetic number, because the mean of its divisors is an integer number (315686514).

Almost surely, 2^1311313203 is an apocalyptic number.

1311313203 is a deficient number, since it is larger than the sum of its proper divisors (582805881).

1311313203 is a wasteful number, since it uses less digits than its factorization.

1311313203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145701473 (or 145701470 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 1311313203 is about 36212.0588064252. The cubic root of 1311313203 is about 1094.5496790947.

Adding to 1311313203 its reverse (3023131131), we get a palindrome (4334444334).

The spelling of 1311313203 in words is "one billion, three hundred eleven million, three hundred thirteen thousand, two hundred three".