161844929 has 4 divisors (see below), whose sum is σ = 161871300. Its totient is φ = 161818560.

The previous prime is 161844899. The next prime is 161844931. The reversal of 161844929 is 929448161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53684929 + 108160000 = 7327^2 + 10400^2 .

It is a cyclic number.

It is not a de Polignac number, because 161844929 - 2⁸ = 161844673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161844929.

It is not an unprimeable number, because it can be changed into a prime (161844959) 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, 1397 + ... + 18045.

It is an arithmetic number, because the mean of its divisors is an integer number (40467825).

Almost surely, 2^161844929 is an apocalyptic number.

It is an amenable number.

161844929 is a deficient number, since it is larger than the sum of its proper divisors (26371).

161844929 is an equidigital number, since it uses as much as digits as its factorization.

161844929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26370.

The product of its digits is 124416, while the sum is 44.

The square root of 161844929 is about 12721.8288386537. The cubic root of 161844929 is about 544.9621823772.

The spelling of 161844929 in words is "one hundred sixty-one million, eight hundred forty-four thousand, nine hundred twenty-nine".