1161881 has 4 divisors (see below), whose sum is σ = 1327872. Its totient is φ = 995892.

The previous prime is 1161877. The next prime is 1161883. The reversal of 1161881 is 1881611.

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 a cyclic number.

It is not a de Polignac number, because 1161881 - 2² = 1161877 is a prime.

It is a super-2 number, since 2×1161881² = 2699934916322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1161881.

It is not an unprimeable number, because it can be changed into a prime (1161883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82985 + ... + 82998.

It is an arithmetic number, because the mean of its divisors is an integer number (331968).

2^1161881 is an apocalyptic number.

It is an amenable number.

1161881 is a deficient number, since it is larger than the sum of its proper divisors (165991).

1161881 is an equidigital number, since it uses as much as digits as its factorization.

1161881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165990.

The product of its digits is 384, while the sum is 26.

The square root of 1161881 is about 1077.9058400436. The cubic root of 1161881 is about 105.1285198763.

The spelling of 1161881 in words is "one million, one hundred sixty-one thousand, eight hundred eighty-one".