1161317123 has 4 divisors (see below), whose sum is σ = 1174365720. Its totient is φ = 1148268528.

The previous prime is 1161317041. The next prime is 1161317149. The reversal of 1161317123 is 3217131611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161317123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1161317092 and 1161317101.

It is not an unprimeable number, because it can be changed into a prime (1161314123) 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, 6524165 + ... + 6524342.

It is an arithmetic number, because the mean of its divisors is an integer number (293591430).

Almost surely, 2^1161317123 is an apocalyptic number.

1161317123 is a deficient number, since it is larger than the sum of its proper divisors (13048597).

1161317123 is an equidigital number, since it uses as much as digits as its factorization.

1161317123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13048596.

The product of its digits is 756, while the sum is 26.

The square root of 1161317123 is about 34078.1032776180. The cubic root of 1161317123 is about 1051.1151034702.

Adding to 1161317123 its reverse (3217131611), we get a palindrome (4378448734).

The spelling of 1161317123 in words is "one billion, one hundred sixty-one million, three hundred seventeen thousand, one hundred twenty-three".