1331181 has 16 divisors (see below), whose sum is σ = 2016000. Its totient is φ = 867744.

The previous prime is 1331153. The next prime is 1331207. The reversal of 1331181 is 1811331.

It is a happy number.

It is not a de Polignac number, because 1331181 - 2¹⁰ = 1330157 is a prime.

It is a super-2 number, since 2×1331181² = 3544085709522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 745 + ... + 1793.

It is an arithmetic number, because the mean of its divisors is an integer number (126000).

2^1331181 is an apocalyptic number.

It is an amenable number.

1331181 is a deficient number, since it is larger than the sum of its proper divisors (684819).

1331181 is a wasteful number, since it uses less digits than its factorization.

1331181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105 (or 1099 counting only the distinct ones).

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

The square root of 1331181 is about 1153.7681742881. The cubic root of 1331181 is about 110.0049859999.

The spelling of 1331181 in words is "one million, three hundred thirty-one thousand, one hundred eighty-one".