1181331 has 8 divisors (see below), whose sum is σ = 1750160. Its totient is φ = 787536.

The previous prime is 1181329. The next prime is 1181407. The reversal of 1181331 is 1331811.

It is a happy number.

It is not a de Polignac number, because 1181331 - 2¹ = 1181329 is a prime.

It is a super-2 number, since 2×1181331² = 2791085863122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1181311) 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, 21850 + ... + 21903.

It is an arithmetic number, because the mean of its divisors is an integer number (218770).

2^1181331 is an apocalyptic number.

1181331 is a deficient number, since it is larger than the sum of its proper divisors (568829).

1181331 is an equidigital number, since it uses as much as digits as its factorization.

1181331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43762 (or 43756 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 1181331 is about 1086.8905188656. The cubic root of 1181331 is about 105.7118971425.

The spelling of 1181331 in words is "one million, one hundred eighty-one thousand, three hundred thirty-one".