161609817 has 8 divisors (see below), whose sum is σ = 216018720. Its totient is φ = 107470400.

The previous prime is 161609771. The next prime is 161609863. The reversal of 161609817 is 718906161.

161609817 is nontrivially palindromic in base 2.

161609817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161609771) and next prime (161609863).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161609817 - 2⁷ = 161609689 is a prime.

It is a super-2 number, since 2×161609817² = 52235465901546978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161602817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65967 + ... + 68372.

It is an arithmetic number, because the mean of its divisors is an integer number (27002340).

Almost surely, 2^161609817 is an apocalyptic number.

It is an amenable number.

161609817 is a deficient number, since it is larger than the sum of its proper divisors (54408903).

161609817 is a wasteful number, since it uses less digits than its factorization.

161609817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134743.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 161609817 is about 12712.5849849667. The cubic root of 161609817 is about 544.6981657802.

The spelling of 161609817 in words is "one hundred sixty-one million, six hundred nine thousand, eight hundred seventeen".