161803689 has 8 divisors (see below), whose sum is σ = 225118272. Its totient is φ = 103179120.

The previous prime is 161803687. The next prime is 161803703. The reversal of 161803689 is 986308161.

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

It is not a de Polignac number, because 161803689 - 2¹ = 161803687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161803689.

It is not an unprimeable number, because it can be changed into a prime (161803687) 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, 1172422 + ... + 1172559.

It is an arithmetic number, because the mean of its divisors is an integer number (28139784).

Almost surely, 2^161803689 is an apocalyptic number.

It is an amenable number.

161803689 is a deficient number, since it is larger than the sum of its proper divisors (63314583).

161803689 is a wasteful number, since it uses less digits than its factorization.

161803689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345007.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 161803689 is about 12720.2078992444. The cubic root of 161803689 is about 544.9158908442.

The spelling of 161803689 in words is "one hundred sixty-one million, eight hundred three thousand, six hundred eighty-nine".