161650219 has 4 divisors (see below), whose sum is σ = 163597896. Its totient is φ = 159702544.

The previous prime is 161650207. The next prime is 161650243. The reversal of 161650219 is 912056161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 912056161 = 59 ⋅15458579.

It is a cyclic number.

It is not a de Polignac number, because 161650219 - 2¹¹ = 161648171 is a prime.

It is a super-2 number, since 2×161650219² = 52261586605495922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161650289) 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 in 3 ways as a sum of consecutive naturals, for example, 973714 + ... + 973879.

It is an arithmetic number, because the mean of its divisors is an integer number (40899474).

Almost surely, 2^161650219 is an apocalyptic number.

161650219 is a deficient number, since it is larger than the sum of its proper divisors (1947677).

161650219 is an equidigital number, since it uses as much as digits as its factorization.

161650219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947676.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 161650219 is about 12714.1739409212. The cubic root of 161650219 is about 544.7435530017.

The spelling of 161650219 in words is "one hundred sixty-one million, six hundred fifty thousand, two hundred nineteen".