1161321001 has 16 divisors (see below), whose sum is σ = 1200666240. Its totient is φ = 1122750720.

The previous prime is 1161320999. The next prime is 1161321019. The reversal of 1161321001 is 1001231611.

It is a cyclic number.

It is not a de Polignac number, because 1161321001 - 2¹ = 1161320999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1161321071) 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 15 ways as a sum of consecutive naturals, for example, 1263220 + ... + 1264138.

It is an arithmetic number, because the mean of its divisors is an integer number (75041640).

Almost surely, 2^1161321001 is an apocalyptic number.

It is an amenable number.

1161321001 is a deficient number, since it is larger than the sum of its proper divisors (39345239).

1161321001 is a wasteful number, since it uses less digits than its factorization.

1161321001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 1161321001 is about 34078.1601762771. The cubic root of 1161321001 is about 1051.1162734693.

Adding to 1161321001 its reverse (1001231611), we get a palindrome (2162552612).

The spelling of 1161321001 in words is "one billion, one hundred sixty-one million, three hundred twenty-one thousand, one".