1161535550 has 144 divisors (see below), whose sum is σ = 2704246560. Its totient is φ = 363121920.

The previous prime is 1161535519. The next prime is 1161535577. The reversal of 1161535550 is 555351611.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3663992 + ... + 3664308.

It is an arithmetic number, because the mean of its divisors is an integer number (18779490).

Almost surely, 2^1161535550 is an apocalyptic number.

1161535550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1161535550 is an abundant number, since it is smaller than the sum of its proper divisors (1542711010).

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

1161535550 is a wasteful number, since it uses less digits than its factorization.

1161535550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 32.

The square root of 1161535550 is about 34081.3079267800. The cubic root of 1161535550 is about 1051.1809992023.

The spelling of 1161535550 in words is "one billion, one hundred sixty-one million, five hundred thirty-five thousand, five hundred fifty".