161219 has 4 divisors (see below), whose sum is σ = 162096. Its totient is φ = 160344.

The previous prime is 161201. The next prime is 161221. The reversal of 161219 is 912161.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161219 is a prime.

It is a super-2 number, since 2×161219² = 51983131922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161219.

It is not an unprimeable number, because it can be changed into a prime (166219) 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, 44 + ... + 569.

It is an arithmetic number, because the mean of its divisors is an integer number (40524).

2¹⁶¹²¹⁹ is an apocalyptic number.

161219 is a deficient number, since it is larger than the sum of its proper divisors (877).

161219 is an equidigital number, since it uses as much as digits as its factorization.

161219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876.

The product of its digits is 108, while the sum is 20.

The square root of 161219 is about 401.5208587359. The cubic root of 161219 is about 54.4258734693.

It can be divided in two parts, 1612 and 19, that multiplied together give a triangular number (30628 = T₂₄₇).

The spelling of 161219 in words is "one hundred sixty-one thousand, two hundred nineteen".