1159811550 has 72 divisors (see below), whose sum is σ = 3120235560. Its totient is φ = 308865600.

The previous prime is 1159811537. The next prime is 1159811551. The reversal of 1159811550 is 551189511.

1159811550 is a `hidden beast` number, since 1 + 1 + 5 + 98 + 11 + 550 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1159811551) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 479845 + ... + 482255.

It is an arithmetic number, because the mean of its divisors is an integer number (43336605).

Almost surely, 2^1159811550 is an apocalyptic number.

1159811550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1159811550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1560117780).

1159811550 is an abundant number, since it is smaller than the sum of its proper divisors (1960424010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1159811550 is a wasteful number, since it uses less digits than its factorization.

1159811550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498 (or 3490 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 36.

The square root of 1159811550 is about 34056.0060782236. The cubic root of 1159811550 is about 1050.6606726450.

The spelling of 1159811550 in words is "one billion, one hundred fifty-nine million, eight hundred eleven thousand, five hundred fifty".