161115517 has 2 divisors, whose sum is σ = 161115518. Its totient is φ = 161115516.

The previous prime is 161115481. The next prime is 161115547. The reversal of 161115517 is 715511161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150945796 + 10169721 = 12286^2 + 3189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161115517 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 (161115547) 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 as a sum of consecutive naturals, namely, 80557758 + 80557759.

It is an arithmetic number, because the mean of its divisors is an integer number (80557759).

Almost surely, 2^161115517 is an apocalyptic number.

It is an amenable number.

161115517 is a deficient number, since it is larger than the sum of its proper divisors (1).

161115517 is an equidigital number, since it uses as much as digits as its factorization.

161115517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1050, while the sum is 28.

The square root of 161115517 is about 12693.1287317194. The cubic root of 161115517 is about 544.1422604534.

Adding to 161115517 its reverse (715511161), we get a palindrome (876626678).

The spelling of 161115517 in words is "one hundred sixty-one million, one hundred fifteen thousand, five hundred seventeen".