1131331 has 2 divisors, whose sum is σ = 1131332. Its totient is φ = 1131330.

The previous prime is 1131329. The next prime is 1131341. The reversal of 1131331 is 1331311.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1131331 - 2¹ = 1131329 is a prime.

It is a super-2 number, since 2×1131331² = 2559819663122, which contains 22 as substring.

Together with 1131329, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1131341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565665 + 565666.

It is an arithmetic number, because the mean of its divisors is an integer number (565666).

2^1131331 is an apocalyptic number.

1131331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131331 is an equidigital number, since it uses as much as digits as its factorization.

1131331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27, while the sum is 13.

The square root of 1131331 is about 1063.6404467676. The cubic root of 1131331 is about 104.1989227750.

Adding to 1131331 its reverse (1331311), we get a palindrome (2462642).

It can be divided in two parts, 11313 and 31, that multiplied together give a triangular number (350703 = T₈₃₇).

The spelling of 1131331 in words is "one million, one hundred thirty-one thousand, three hundred thirty-one".