1171728885 has 16 divisors (see below), whose sum is σ = 1877167296. Its totient is φ = 624121728.

The previous prime is 1171728853. The next prime is 1171728889. The reversal of 1171728885 is 5888271711.

It is not a de Polignac number, because 1171728885 - 2⁵ = 1171728853 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171728889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37824 + ... + 61433.

It is an arithmetic number, because the mean of its divisors is an integer number (117322956).

Almost surely, 2^1171728885 is an apocalyptic number.

1171728885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1171728885 is a deficient number, since it is larger than the sum of its proper divisors (705438411).

1171728885 is an equidigital number, since it uses as much as digits as its factorization.

1171728885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100052.

The product of its digits is 250880, while the sum is 48.

The square root of 1171728885 is about 34230.5256313718. The cubic root of 1171728885 is about 1054.2470117921.

The spelling of 1171728885 in words is "one billion, one hundred seventy-one million, seven hundred twenty-eight thousand, eight hundred eighty-five".