1161728271 has 16 divisors (see below), whose sum is σ = 1877541120. Its totient is φ = 704077560.

The previous prime is 1161728263. The next prime is 1161728311. The reversal of 1161728271 is 1728271611.

1161728271 is a `hidden beast` number, since 11 + 617 + 2 + 8 + 27 + 1 = 666.

It is not a de Polignac number, because 1161728271 - 2³ = 1161728263 is a prime.

It is a super-2 number, since 2×1161728271² = 2699225151281298882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161728261) 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, 1955475 + ... + 1956068.

It is an arithmetic number, because the mean of its divisors is an integer number (117346320).

Almost surely, 2^1161728271 is an apocalyptic number.

1161728271 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1161728271 is a deficient number, since it is larger than the sum of its proper divisors (715812849).

1161728271 is a wasteful number, since it uses less digits than its factorization.

1161728271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3911563 (or 3911557 counting only the distinct ones).

The product of its digits is 9408, while the sum is 36.

The square root of 1161728271 is about 34084.1351804619. The cubic root of 1161728271 is about 1051.2391330092.

Adding to 1161728271 its reverse (1728271611), we get a palindrome (2889999882).

The spelling of 1161728271 in words is "one billion, one hundred sixty-one million, seven hundred twenty-eight thousand, two hundred seventy-one".