1161301185 has 128 divisors (see below), whose sum is σ = 2405376000. Its totient is φ = 525657600.

The previous prime is 1161301177. The next prime is 1161301231. The reversal of 1161301185 is 5811031611.

It is a happy number.

It is not a de Polignac number, because 1161301185 - 2³ = 1161301177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2228725 + ... + 2229245.

It is an arithmetic number, because the mean of its divisors is an integer number (18792000).

Almost surely, 2^1161301185 is an apocalyptic number.

1161301185 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1161301185 is an abundant number, since it is smaller than the sum of its proper divisors (1244074815).

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

1161301185 is a wasteful number, since it uses less digits than its factorization.

1161301185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644 (or 638 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 1161301185 is about 34077.8694316414. The cubic root of 1161301185 is about 1051.1102949217.

Adding to 1161301185 its reverse (5811031611), we get a palindrome (6972332796).

The spelling of 1161301185 in words is "one billion, one hundred sixty-one million, three hundred one thousand, one hundred eighty-five".