161716571 has 2 divisors, whose sum is σ = 161716572. Its totient is φ = 161716570.

The previous prime is 161716567. The next prime is 161716573. The reversal of 161716571 is 175617161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161716571 - 2² = 161716567 is a prime.

Together with 161716573, 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 (161716573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80858285 + 80858286.

It is an arithmetic number, because the mean of its divisors is an integer number (80858286).

Almost surely, 2^161716571 is an apocalyptic number.

161716571 is a deficient number, since it is larger than the sum of its proper divisors (1).

161716571 is an equidigital number, since it uses as much as digits as its factorization.

161716571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 35.

The square root of 161716571 is about 12716.7830444653. The cubic root of 161716571 is about 544.8180757999.

The spelling of 161716571 in words is "one hundred sixty-one million, seven hundred sixteen thousand, five hundred seventy-one".