161187839 has 2 divisors, whose sum is σ = 161187840. Its totient is φ = 161187838.

The previous prime is 161187827. The next prime is 161187853. The reversal of 161187839 is 938781161.

It is a weak prime.

It is an emirp because it is prime and its reverse (938781161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161187839 - 2²⁰ = 160139263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161187839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161187809) 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 as a sum of consecutive naturals, namely, 80593919 + 80593920.

It is an arithmetic number, because the mean of its divisors is an integer number (80593920).

Almost surely, 2^161187839 is an apocalyptic number.

161187839 is a deficient number, since it is larger than the sum of its proper divisors (1).

161187839 is an equidigital number, since it uses as much as digits as its factorization.

161187839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 44.

The square root of 161187839 is about 12695.9772762872. The cubic root of 161187839 is about 544.2236669920.

The spelling of 161187839 in words is "one hundred sixty-one million, one hundred eighty-seven thousand, eight hundred thirty-nine".