1131312211 has 4 divisors (see below), whose sum is σ = 1142513424. Its totient is φ = 1120111000.

The previous prime is 1131312181. The next prime is 1131312229. The reversal of 1131312211 is 1122131311.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1131312211 - 2⁵ = 1131312179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131312251) 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, 5600455 + ... + 5600656.

It is an arithmetic number, because the mean of its divisors is an integer number (285628356).

Almost surely, 2^1131312211 is an apocalyptic number.

1131312211 is a deficient number, since it is larger than the sum of its proper divisors (11201213).

1131312211 is a wasteful number, since it uses less digits than its factorization.

1131312211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11201212.

The product of its digits is 36, while the sum is 16.

The square root of 1131312211 is about 33634.9849264126. The cubic root of 1131312211 is about 1041.9834593106.

Adding to 1131312211 its reverse (1122131311), we get a palindrome (2253443522).

Subtracting from 1131312211 its reverse (1122131311), we obtain a square (9180900 = 3030²).

The spelling of 1131312211 in words is "one billion, one hundred thirty-one million, three hundred twelve thousand, two hundred eleven".