1161821289 has 8 divisors (see below), whose sum is σ = 1553411520. Its totient is φ = 772389296.

The previous prime is 1161821267. The next prime is 1161821363. The reversal of 1161821289 is 9821281611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1161821289 - 2⁷ = 1161821161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1161821389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 538302 + ... + 540455.

It is an arithmetic number, because the mean of its divisors is an integer number (194176440).

Almost surely, 2^1161821289 is an apocalyptic number.

It is an amenable number.

1161821289 is a deficient number, since it is larger than the sum of its proper divisors (391590231).

1161821289 is a wasteful number, since it uses less digits than its factorization.

1161821289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079119.

The product of its digits is 13824, while the sum is 39.

The square root of 1161821289 is about 34085.4996882839. The cubic root of 1161821289 is about 1051.2671893555.

The spelling of 1161821289 in words is "one billion, one hundred sixty-one million, eight hundred twenty-one thousand, two hundred eighty-nine".