1163181 has 4 divisors (see below), whose sum is σ = 1550912. Its totient is φ = 775452.

The previous prime is 1163177. The next prime is 1163189. The reversal of 1163181 is 1813611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1163181 - 2² = 1163177 is a prime.

It is a super-2 number, since 2×1163181² = 2705980077522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163189) 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, 193861 + ... + 193866.

It is an arithmetic number, because the mean of its divisors is an integer number (387728).

2^1163181 is an apocalyptic number.

It is an amenable number.

1163181 is a deficient number, since it is larger than the sum of its proper divisors (387731).

1163181 is an equidigital number, since it uses as much as digits as its factorization.

1163181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387730.

The product of its digits is 144, while the sum is 21.

The square root of 1163181 is about 1078.5086925936. The cubic root of 1163181 is about 105.1677138317.

Adding to 1163181 its reverse (1813611), we get a palindrome (2976792).

The spelling of 1163181 in words is "one million, one hundred sixty-three thousand, one hundred eighty-one".