1161273264 has 40 divisors (see below), whose sum is σ = 3176426160. Its totient is φ = 364320768.

The previous prime is 1161273263. The next prime is 1161273277. The reversal of 1161273264 is 4623721611.

It is not an unprimeable number, because it can be changed into a prime (1161273263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 710749 + ... + 712380.

It is an arithmetic number, because the mean of its divisors is an integer number (79410654).

Almost surely, 2^1161273264 is an apocalyptic number.

It is an amenable number.

1161273264 is an abundant number, since it is smaller than the sum of its proper divisors (2015152896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161273264 is a wasteful number, since it uses less digits than its factorization.

1161273264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423157 (or 1423151 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 1161273264 is about 34077.4597644836. The cubic root of 1161273264 is about 1051.1018709555.

Adding to 1161273264 its reverse (4623721611), we get a palindrome (5784994875).

The spelling of 1161273264 in words is "one billion, one hundred sixty-one million, two hundred seventy-three thousand, two hundred sixty-four".