1188801081 has 12 divisors (see below), whose sum is σ = 1849246308. Its totient is φ = 731569824.

The previous prime is 1188801079. The next prime is 1188801121. The reversal of 1188801081 is 1801088811.

It can be written as a sum of positive squares in 2 ways, for example, as 735494400 + 453306681 = 27120^2 + 21291^2 .

It is not a de Polignac number, because 1188801081 - 2¹ = 1188801079 is a prime.

It is a super-2 number, since 2×1188801081² = 2826496020373537122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1188801781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5080230 + ... + 5080463.

It is an arithmetic number, because the mean of its divisors is an integer number (154103859).

Almost surely, 2^1188801081 is an apocalyptic number.

It is an amenable number.

1188801081 is a deficient number, since it is larger than the sum of its proper divisors (660445227).

1188801081 is a wasteful number, since it uses less digits than its factorization.

1188801081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10160712 (or 10160709 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 36.

The square root of 1188801081 is about 34478.9947794306. The cubic root of 1188801081 is about 1059.3425022427.

Adding to 1188801081 its reverse (1801088811), we get a palindrome (2989889892).

The spelling of 1188801081 in words is "one billion, one hundred eighty-eight million, eight hundred one thousand, eighty-one".