161086939 has 4 divisors (see below), whose sum is σ = 173478256. Its totient is φ = 148695624.

The previous prime is 161086931. The next prime is 161086957. The reversal of 161086939 is 939680161.

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 161086939 - 2³ = 161086931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161086895 and 161086904.

It is not an unprimeable number, because it can be changed into a prime (161086931) 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, 6195639 + ... + 6195664.

It is an arithmetic number, because the mean of its divisors is an integer number (43369564).

Almost surely, 2^161086939 is an apocalyptic number.

161086939 is a deficient number, since it is larger than the sum of its proper divisors (12391317).

161086939 is a wasteful number, since it uses less digits than its factorization.

161086939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12391316.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 161086939 is about 12692.0029546167. The cubic root of 161086939 is about 544.1100859877.

The spelling of 161086939 in words is "one hundred sixty-one million, eighty-six thousand, nine hundred thirty-nine".