161716501 has 2 divisors, whose sum is σ = 161716502. Its totient is φ = 161716500.

The previous prime is 161716469. The next prime is 161716517. The reversal of 161716501 is 105617161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158382225 + 3334276 = 12585^2 + 1826^2 .

It is a cyclic number.

It is not a de Polignac number, because 161716501 - 2⁵ = 161716469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161716501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161716531) 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, 80858250 + 80858251.

It is an arithmetic number, because the mean of its divisors is an integer number (80858251).

Almost surely, 2^161716501 is an apocalyptic number.

It is an amenable number.

161716501 is a deficient number, since it is larger than the sum of its proper divisors (1).

161716501 is an equidigital number, since it uses as much as digits as its factorization.

161716501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 161716501 is about 12716.7802921966. The cubic root of 161716501 is about 544.8179971906.

The spelling of 161716501 in words is "one hundred sixty-one million, seven hundred sixteen thousand, five hundred one".