1161512321 has 8 divisors (see below), whose sum is σ = 1202601000. Its totient is φ = 1120492800.

The previous prime is 1161512311. The next prime is 1161512333. The reversal of 1161512321 is 1232151611.

It can be written as a sum of positive squares in 4 ways, for example, as 131423296 + 1030089025 = 11464^2 + 32095^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161512321 is a prime.

It is a super-2 number, since 2×1161512321² = 2698221743669614082, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1161512311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18155 + ... + 51503.

It is an arithmetic number, because the mean of its divisors is an integer number (150325125).

Almost surely, 2^1161512321 is an apocalyptic number.

It is an amenable number.

1161512321 is a deficient number, since it is larger than the sum of its proper divisors (41088679).

1161512321 is a wasteful number, since it uses less digits than its factorization.

1161512321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34579.

The product of its digits is 360, while the sum is 23.

The square root of 1161512321 is about 34080.9671370987. The cubic root of 1161512321 is about 1051.1739917984.

Adding to 1161512321 its reverse (1232151611), we get a palindrome (2393663932).

The spelling of 1161512321 in words is "one billion, one hundred sixty-one million, five hundred twelve thousand, three hundred twenty-one".