161643017 has 2 divisors, whose sum is σ = 161643018. Its totient is φ = 161643016.

The previous prime is 161642983. The next prime is 161643019. The reversal of 161643017 is 710346161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140446201 + 21196816 = 11851^2 + 4604^2 .

It is a cyclic number.

It is not a de Polignac number, because 161643017 - 2¹⁰ = 161641993 is a prime.

It is a super-2 number, since 2×161643017² = 52256929889724578, which contains 22 as substring.

Together with 161643019, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161643019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80821508 + 80821509.

It is an arithmetic number, because the mean of its divisors is an integer number (80821509).

Almost surely, 2^161643017 is an apocalyptic number.

It is an amenable number.

161643017 is a deficient number, since it is larger than the sum of its proper divisors (1).

161643017 is an equidigital number, since it uses as much as digits as its factorization.

161643017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 161643017 is about 12713.8907105575. The cubic root of 161643017 is about 544.7354628975.

Adding to 161643017 its reverse (710346161), we get a palindrome (871989178).

The spelling of 161643017 in words is "one hundred sixty-one million, six hundred forty-three thousand, seventeen".