1161395550 has 288 divisors, whose sum is σ = 3781945440. Its totient is φ = 261273600.

The previous prime is 1161395533. The next prime is 1161395551. The reversal of 1161395550 is 555931611.

1161395550 is a `hidden beast` number, since 1 + 1 + 6 + 13 + 95 + 550 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161395551) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 6416460 + ... + 6416640.

It is an arithmetic number, because the mean of its divisors is an integer number (13131755).

Almost surely, 2^1161395550 is an apocalyptic number.

1161395550 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 1161395550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1890972720).

1161395550 is an abundant number, since it is smaller than the sum of its proper divisors (2620549890).

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

1161395550 is a wasteful number, since it uses less digits than its factorization.

1161395550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 36.

The square root of 1161395550 is about 34079.2539531017. The cubic root of 1161395550 is about 1051.1387645205.

The spelling of 1161395550 in words is "one billion, one hundred sixty-one million, three hundred ninety-five thousand, five hundred fifty".