1131311 has 8 divisors (see below), whose sum is σ = 1164240. Its totient is φ = 1099008.

The previous prime is 1131307. The next prime is 1131323.

It is a happy number.

1131311 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 1131311 - 2² = 1131307 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131292 and 1131301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131331) 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, 10325 + ... + 10433.

It is an arithmetic number, because the mean of its divisors is an integer number (145530).

2^1131311 is an apocalyptic number.

1131311 is a deficient number, since it is larger than the sum of its proper divisors (32929).

1131311 is a wasteful number, since it uses less digits than its factorization.

1131311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313.

The product of its digits is 9, while the sum is 11.

The square root of 1131311 is about 1063.6310450527. The cubic root of 1131311 is about 104.1983087517.

Multiplying 1131311 by its sum of digits (11), we get a palindrome (12444421).

The spelling of 1131311 in words is "one million, one hundred thirty-one thousand, three hundred eleven".