161995017 has 4 divisors (see below), whose sum is σ = 215993360. Its totient is φ = 107996676.

The previous prime is 161995013. The next prime is 161995063. The reversal of 161995017 is 710599161.

161995017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 710599161 = 3 ⋅236866387.

It is not a de Polignac number, because 161995017 - 2² = 161995013 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161995013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26999167 + ... + 26999172.

It is an arithmetic number, because the mean of its divisors is an integer number (53998340).

Almost surely, 2^161995017 is an apocalyptic number.

It is an amenable number.

161995017 is a deficient number, since it is larger than the sum of its proper divisors (53998343).

161995017 is an equidigital number, since it uses as much as digits as its factorization.

161995017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53998342.

The product of its (nonzero) digits is 17010, while the sum is 39.

The square root of 161995017 is about 12727.7263091253. The cubic root of 161995017 is about 545.1305884640.

The spelling of 161995017 in words is "one hundred sixty-one million, nine hundred ninety-five thousand, seventeen".