161810017 has 2 divisors, whose sum is σ = 161810018. Its totient is φ = 161810016.

The previous prime is 161809981. The next prime is 161810041. The reversal of 161810017 is 710018161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91987281 + 69822736 = 9591^2 + 8356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161810017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161809973 and 161810000.

It is not a weakly prime, because it can be changed into another prime (161810417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80905008 + 80905009.

It is an arithmetic number, because the mean of its divisors is an integer number (80905009).

Almost surely, 2^161810017 is an apocalyptic number.

It is an amenable number.

161810017 is a deficient number, since it is larger than the sum of its proper divisors (1).

161810017 is an equidigital number, since it uses as much as digits as its factorization.

161810017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 25.

The square root of 161810017 is about 12720.4566348854. The cubic root of 161810017 is about 544.9229944787.

Adding to 161810017 its reverse (710018161), we get a palindrome (871828178).

The spelling of 161810017 in words is "one hundred sixty-one million, eight hundred ten thousand, seventeen".