161444839 has 4 divisors (see below), whose sum is σ = 165382560. Its totient is φ = 157507120.

The previous prime is 161444831. The next prime is 161444861. The reversal of 161444839 is 938444161.

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 161444839 - 2³ = 161444831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161444831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1968799 + ... + 1968880.

It is an arithmetic number, because the mean of its divisors is an integer number (41345640).

Almost surely, 2^161444839 is an apocalyptic number.

161444839 is a deficient number, since it is larger than the sum of its proper divisors (3937721).

161444839 is an equidigital number, since it uses as much as digits as its factorization.

161444839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3937720.

The product of its digits is 82944, while the sum is 40.

The square root of 161444839 is about 12706.0945612726. The cubic root of 161444839 is about 544.5127525182.

The spelling of 161444839 in words is "one hundred sixty-one million, four hundred forty-four thousand, eight hundred thirty-nine".