161391219 has 32 divisors (see below), whose sum is σ = 239640576. Its totient is φ = 95800320.

The previous prime is 161391199. The next prime is 161391227. The reversal of 161391219 is 912193161.

It is not a de Polignac number, because 161391219 - 2¹¹ = 161389171 is a prime.

It is a super-2 number, since 2×161391219² = 52094251140611922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 161391219.

It is not an unprimeable number, because it can be changed into a prime (161391229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 406329 + ... + 406725.

It is an arithmetic number, because the mean of its divisors is an integer number (7488768).

Almost surely, 2^161391219 is an apocalyptic number.

161391219 is a deficient number, since it is larger than the sum of its proper divisors (78249357).

161391219 is a wasteful number, since it uses less digits than its factorization.

161391219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635.

The product of its digits is 2916, while the sum is 33.

The square root of 161391219 is about 12703.9843749904. The cubic root of 161391219 is about 544.4524635945.

The spelling of 161391219 in words is "one hundred sixty-one million, three hundred ninety-one thousand, two hundred nineteen".