1181161 has 4 divisors (see below), whose sum is σ = 1184400. Its totient is φ = 1177924.

The previous prime is 1181153. The next prime is 1181171. The reversal of 1181161 is 1611811.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1611811 = 1237 ⋅1303.

It is a cyclic number.

It is not a de Polignac number, because 1181161 - 2³ = 1181153 is a prime.

It is a Duffinian number.

1181161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1181171) 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, 991 + ... + 1828.

It is an arithmetic number, because the mean of its divisors is an integer number (296100).

2^1181161 is an apocalyptic number.

It is an amenable number.

1181161 is a deficient number, since it is larger than the sum of its proper divisors (3239).

1181161 is an equidigital number, since it uses as much as digits as its factorization.

1181161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3238.

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

The square root of 1181161 is about 1086.8123113031. The cubic root of 1181161 is about 105.7068260589.

Adding to 1181161 its reverse (1611811), we get a palindrome (2792972).

The spelling of 1181161 in words is "one million, one hundred eighty-one thousand, one hundred sixty-one".