161707517 has 2 divisors, whose sum is σ = 161707518. Its totient is φ = 161707516.

The previous prime is 161707471. The next prime is 161707531. The reversal of 161707517 is 715707161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160300921 + 1406596 = 12661^2 + 1186^2 .

It is a cyclic number.

It is not a de Polignac number, because 161707517 - 2⁶ = 161707453 is a prime.

It is a super-2 number, since 2×161707517² = 52298642108610578, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161707577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80853758 + 80853759.

It is an arithmetic number, because the mean of its divisors is an integer number (80853759).

Almost surely, 2^161707517 is an apocalyptic number.

It is an amenable number.

161707517 is a deficient number, since it is larger than the sum of its proper divisors (1).

161707517 is an equidigital number, since it uses as much as digits as its factorization.

161707517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10290, while the sum is 35.

The square root of 161707517 is about 12716.4270532253. The cubic root of 161707517 is about 544.8079080624.

The spelling of 161707517 in words is "one hundred sixty-one million, seven hundred seven thousand, five hundred seventeen".