1811161 has 8 divisors (see below), whose sum is σ = 1987200. Its totient is φ = 1637040.

The previous prime is 1811141. The next prime is 1811167. The reversal of 1811161 is 1611181.

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 1811161 - 2⁹ = 1810649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1811167) 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, 2160 + ... + 2878.

It is an arithmetic number, because the mean of its divisors is an integer number (248400).

2^1811161 is an apocalyptic number.

1811161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1811161 is a deficient number, since it is larger than the sum of its proper divisors (176039).

1811161 is a wasteful number, since it uses less digits than its factorization.

1811161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959.

The product of its digits is 48, while the sum is 19.

The square root of 1811161 is about 1345.7938177893. The cubic root of 1811161 is about 121.8949422550.

The spelling of 1811161 in words is "one million, eight hundred eleven thousand, one hundred sixty-one".