1155889999 has 32 divisors (see below), whose sum is σ = 1320883200. Its totient is φ = 1002374400.

The previous prime is 1155889979. The next prime is 1155890003. The reversal of 1155889999 is 9999885511.

It is a cyclic number.

It is not a de Polignac number, because 1155889999 - 2⁵ = 1155889967 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 1155889999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155889919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6921414 + ... + 6921580.

It is an arithmetic number, because the mean of its divisors is an integer number (41277600).

Almost surely, 2^1155889999 is an apocalyptic number.

1155889999 is a deficient number, since it is larger than the sum of its proper divisors (164993201).

1155889999 is a wasteful number, since it uses less digits than its factorization.

1155889999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471.

The product of its digits is 10497600, while the sum is 64.

The square root of 1155889999 is about 33998.3822997507. The cubic root of 1155889999 is about 1049.4751720317.

The spelling of 1155889999 in words is "one billion, one hundred fifty-five million, eight hundred eighty-nine thousand, nine hundred ninety-nine".