1172788889 has 16 divisors (see below), whose sum is σ = 1273735680. Its totient is φ = 1076042880.

The previous prime is 1172788861. The next prime is 1172788933. The reversal of 1172788889 is 9888872711.

It is not a de Polignac number, because 1172788889 - 2¹² = 1172784793 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1172788819) 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 15 ways as a sum of consecutive naturals, for example, 153029 + ... + 160509.

It is an arithmetic number, because the mean of its divisors is an integer number (79608480).

Almost surely, 2^1172788889 is an apocalyptic number.

1172788889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1172788889 is a deficient number, since it is larger than the sum of its proper divisors (100946791).

1172788889 is a wasteful number, since it uses less digits than its factorization.

1172788889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7760.

The product of its digits is 3612672, while the sum is 59.

The square root of 1172788889 is about 34246.0054458911. The cubic root of 1172788889 is about 1054.5648240008.

The spelling of 1172788889 in words is "one billion, one hundred seventy-two million, seven hundred eighty-eight thousand, eight hundred eighty-nine".