161530717 has 2 divisors, whose sum is σ = 161530718. Its totient is φ = 161530716.

The previous prime is 161530709. The next prime is 161530727. The reversal of 161530717 is 717035161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95043001 + 66487716 = 9749^2 + 8154^2 .

It is a cyclic number.

It is not a de Polignac number, because 161530717 - 2³ = 161530709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161530727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80765358 + 80765359.

It is an arithmetic number, because the mean of its divisors is an integer number (80765359).

Almost surely, 2^161530717 is an apocalyptic number.

It is an amenable number.

161530717 is a deficient number, since it is larger than the sum of its proper divisors (1).

161530717 is an equidigital number, since it uses as much as digits as its factorization.

161530717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4410, while the sum is 31.

The square root of 161530717 is about 12709.4735138793. The cubic root of 161530717 is about 544.6092836874.

Adding to 161530717 its reverse (717035161), we get a palindrome (878565878).

The spelling of 161530717 in words is "one hundred sixty-one million, five hundred thirty thousand, seven hundred seventeen".