1311811131 has 8 divisors (see below), whose sum is σ = 1750296064. Its totient is φ = 873933480.

The previous prime is 1311811117. The next prime is 1311811181. The reversal of 1311811131 is 1311181131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1311811131 - 2²⁵ = 1278256699 is a prime.

It is a super-2 number, since 2×1311811131² = 3441696886830998322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311811098 and 1311811107.

It is not an unprimeable number, because it can be changed into a prime (1311811181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146755 + ... + 155436.

It is an arithmetic number, because the mean of its divisors is an integer number (218787008).

Almost surely, 2^1311811131 is an apocalyptic number.

1311811131 is a deficient number, since it is larger than the sum of its proper divisors (438484933).

1311811131 is a wasteful number, since it uses less digits than its factorization.

1311811131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303641.

The product of its digits is 72, while the sum is 21.

The square root of 1311811131 is about 36218.9333222280. The cubic root of 1311811131 is about 1094.6882012935.

Adding to 1311811131 its reverse (1311181131), we get a palindrome (2622992262).

The spelling of 1311811131 in words is "one billion, three hundred eleven million, eight hundred eleven thousand, one hundred thirty-one".