1161281317 has 4 divisors (see below), whose sum is σ = 1327178656. Its totient is φ = 995383980.

The previous prime is 1161281309. The next prime is 1161281377. The reversal of 1161281317 is 7131821611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1161281317 - 2³ = 1161281309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161281377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82948659 + ... + 82948672.

It is an arithmetic number, because the mean of its divisors is an integer number (331794664).

Almost surely, 2^1161281317 is an apocalyptic number.

It is an amenable number.

1161281317 is a deficient number, since it is larger than the sum of its proper divisors (165897339).

1161281317 is an equidigital number, since it uses as much as digits as its factorization.

1161281317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165897338.

The product of its digits is 2016, while the sum is 31.

The square root of 1161281317 is about 34077.5779215601. The cubic root of 1161281317 is about 1051.1043006173.

It can be divided in two parts, 11612 and 81317, that added together give a palindrome (92929).

The spelling of 1161281317 in words is "one billion, one hundred sixty-one million, two hundred eighty-one thousand, three hundred seventeen".