1081291688 has 32 divisors (see below), whose sum is σ = 2082303720. Its totient is φ = 526080000.

The previous prime is 1081291667. The next prime is 1081291711. The reversal of 1081291688 is 8861921801.

It is a Cunningham number, because it is equal to 32883²-1.

It can be written as a sum of positive squares in 4 ways, for example, as 1077283684 + 4008004 = 32822^2 + 2002^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127418 + ... + 135638.

Almost surely, 2^1081291688 is an apocalyptic number.

It is an amenable number.

1081291688 is a deficient number, since it is larger than the sum of its proper divisors (1001012032).

1081291688 is a wasteful number, since it uses less digits than its factorization.

1081291688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8669 (or 8665 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 44.

The square root of 1081291688 is about 32882.9999847946. Note that the first 4 decimals coincide. The cubic root of 1081291688 is about 1026.3944338269.

The spelling of 1081291688 in words is "one billion, eighty-one million, two hundred ninety-one thousand, six hundred eighty-eight".