1881181285 has 4 divisors (see below), whose sum is σ = 2257417548. Its totient is φ = 1504945024.

The previous prime is 1881181283. The next prime is 1881181297. The reversal of 1881181285 is 5821811881.

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

It can be written as a sum of positive squares in 2 ways, for example, as 964847844 + 916333441 = 31062^2 + 30271^2 .

It is a cyclic number.

It is not a de Polignac number, because 1881181285 - 2¹ = 1881181283 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881181283) 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, 188118124 + ... + 188118133.

It is an arithmetic number, because the mean of its divisors is an integer number (564354387).

Almost surely, 2^1881181285 is an apocalyptic number.

It is an amenable number.

1881181285 is a deficient number, since it is larger than the sum of its proper divisors (376236263).

1881181285 is an equidigital number, since it uses as much as digits as its factorization.

1881181285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376236262.

The product of its digits is 40960, while the sum is 43.

The square root of 1881181285 is about 43372.5867916591. The cubic root of 1881181285 is about 1234.4596050198.

The spelling of 1881181285 in words is "one billion, eight hundred eighty-one million, one hundred eighty-one thousand, two hundred eighty-five".