161230219 has 4 divisors (see below), whose sum is σ = 169716040. Its totient is φ = 152744400.

The previous prime is 161230217. The next prime is 161230229. The reversal of 161230219 is 912032161.

161230219 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.

It is a cyclic number.

It is not a de Polignac number, because 161230219 - 2¹ = 161230217 is a prime.

It is a super-2 number, since 2×161230219² = 51990367037575922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161230193 and 161230202.

It is not an unprimeable number, because it can be changed into a prime (161230211) 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, 4242882 + ... + 4242919.

It is an arithmetic number, because the mean of its divisors is an integer number (42429010).

Almost surely, 2^161230219 is an apocalyptic number.

161230219 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

161230219 is a deficient number, since it is larger than the sum of its proper divisors (8485821).

161230219 is an equidigital number, since it uses as much as digits as its factorization.

161230219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8485820.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 161230219 is about 12697.6461991977. The cubic root of 161230219 is about 544.2713591299.

The spelling of 161230219 in words is "one hundred sixty-one million, two hundred thirty thousand, two hundred nineteen".