1161247321 has 16 divisors (see below), whose sum is σ = 1296655360. Its totient is φ = 1032730560.

The previous prime is 1161247309. The next prime is 1161247327. The reversal of 1161247321 is 1237421611.

It is a cyclic number.

It is not a de Polignac number, because 1161247321 - 2⁵ = 1161247289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1161247321.

It is not an unprimeable number, because it can be changed into a prime (1161247327) 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, 85996 + ... + 98578.

It is an arithmetic number, because the mean of its divisors is an integer number (81040960).

Almost surely, 2^1161247321 is an apocalyptic number.

It is an amenable number.

1161247321 is a deficient number, since it is larger than the sum of its proper divisors (135408039).

1161247321 is a wasteful number, since it uses less digits than its factorization.

1161247321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12856.

The product of its digits is 2016, while the sum is 28.

The square root of 1161247321 is about 34077.0791148537. The cubic root of 1161247321 is about 1051.0940436451.

Adding to 1161247321 its reverse (1237421611), we get a palindrome (2398668932).

The spelling of 1161247321 in words is "one billion, one hundred sixty-one million, two hundred forty-seven thousand, three hundred twenty-one".