8111181285 has 24 divisors (see below), whose sum is σ = 14289867384. Its totient is φ = 4255044480.

The previous prime is 8111181259. The next prime is 8111181307. The reversal of 8111181285 is 5821811118.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1065761316 + 7045419969 = 32646^2 + 83937^2 .

It is not a de Polignac number, because 8111181285 - 2¹⁵ = 8111148517 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1474702 + ... + 1480191.

It is an arithmetic number, because the mean of its divisors is an integer number (595411141).

Almost surely, 2^8111181285 is an apocalyptic number.

It is an amenable number.

8111181285 is a deficient number, since it is larger than the sum of its proper divisors (6178686099).

8111181285 is a wasteful number, since it uses less digits than its factorization.

8111181285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2954965 (or 2954962 counting only the distinct ones).

The product of its digits is 5120, while the sum is 36.

The square root of 8111181285 is about 90062.0968276888. The cubic root of 8111181285 is about 2009.2225143298. Note that the first 3 decimals are identical.

The spelling of 8111181285 in words is "eight billion, one hundred eleven million, one hundred eighty-one thousand, two hundred eighty-five".