1182818881 has 4 divisors (see below), whose sum is σ = 1211668164. Its totient is φ = 1153969600.

The previous prime is 1182818869. The next prime is 1182818893. The reversal of 1182818881 is 1888182811.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1182818869) and next prime (1182818893).

It can be written as a sum of positive squares in 2 ways, for example, as 712623025 + 470195856 = 26695^2 + 21684^2 .

It is not a de Polignac number, because 1182818881 - 2⁷ = 1182818753 is a prime.

It is a super-2 number, since 2×1182818881² = 2798121010500184322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1182818801) 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, 14424580 + ... + 14424661.

It is an arithmetic number, because the mean of its divisors is an integer number (302917041).

Almost surely, 2^1182818881 is an apocalyptic number.

It is an amenable number.

1182818881 is a deficient number, since it is larger than the sum of its proper divisors (28849283).

1182818881 is an equidigital number, since it uses as much as digits as its factorization.

1182818881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28849282.

The product of its digits is 65536, while the sum is 46.

The square root of 1182818881 is about 34392.1339989248. The cubic root of 1182818881 is about 1057.5625974008.

The spelling of 1182818881 in words is "one billion, one hundred eighty-two million, eight hundred eighteen thousand, eight hundred eighty-one".