161113817 has 2 divisors, whose sum is σ = 161113818. Its totient is φ = 161113816.

The previous prime is 161113739. The next prime is 161113831. The reversal of 161113817 is 718311161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158860816 + 2253001 = 12604^2 + 1501^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161113817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161113817.

It is not a weakly prime, because it can be changed into another prime (161113867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80556908 + 80556909.

It is an arithmetic number, because the mean of its divisors is an integer number (80556909).

Almost surely, 2^161113817 is an apocalyptic number.

It is an amenable number.

161113817 is a deficient number, since it is larger than the sum of its proper divisors (1).

161113817 is an equidigital number, since it uses as much as digits as its factorization.

161113817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 29.

The square root of 161113817 is about 12693.0617661776. The cubic root of 161113817 is about 544.1403466194.

Adding to 161113817 its reverse (718311161), we get a palindrome (879424978).

The spelling of 161113817 in words is "one hundred sixty-one million, one hundred thirteen thousand, eight hundred seventeen".