1163185261 has 16 divisors (see below), whose sum is σ = 1350328320. Its totient is φ = 981333360.

The previous prime is 1163185249. The next prime is 1163185267. The reversal of 1163185261 is 1625813611.

It is not a de Polignac number, because 1163185261 - 2⁵ = 1163185229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163185267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365700 + ... + 368866.

It is an arithmetic number, because the mean of its divisors is an integer number (84395520).

Almost surely, 2^1163185261 is an apocalyptic number.

It is an amenable number.

1163185261 is a deficient number, since it is larger than the sum of its proper divisors (187143059).

1163185261 is an equidigital number, since it uses as much as digits as its factorization.

1163185261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3984.

The product of its digits is 8640, while the sum is 34.

The square root of 1163185261 is about 34105.5019168462. The cubic root of 1163185261 is about 1051.6784224944.

Adding to 1163185261 its reverse (1625813611), we get a palindrome (2788998872).

The spelling of 1163185261 in words is "one billion, one hundred sixty-three million, one hundred eighty-five thousand, two hundred sixty-one".