161117717 has 2 divisors, whose sum is σ = 161117718. Its totient is φ = 161117716.

The previous prime is 161117699. The next prime is 161117729. The reversal of 161117717 is 717711161.

It is a happy number.

161117717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83923921 + 77193796 = 9161^2 + 8786^2 .

It is a cyclic number.

It is not a de Polignac number, because 161117717 - 2¹² = 161113621 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161117767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80558858 + 80558859.

It is an arithmetic number, because the mean of its divisors is an integer number (80558859).

Almost surely, 2^161117717 is an apocalyptic number.

It is an amenable number.

161117717 is a deficient number, since it is larger than the sum of its proper divisors (1).

161117717 is an equidigital number, since it uses as much as digits as its factorization.

161117717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2058, while the sum is 32.

The square root of 161117717 is about 12693.2153924843. The cubic root of 161117717 is about 544.1447371599.

Adding to 161117717 its reverse (717711161), we get a palindrome (878828878).

The spelling of 161117717 in words is "one hundred sixty-one million, one hundred seventeen thousand, seven hundred seventeen".