161139 has 16 divisors (see below), whose sum is σ = 247680. Its totient is φ = 92160.

The previous prime is 161137. The next prime is 161141. The reversal of 161139 is 931161.

It is a happy number.

161139 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161137) and next prime (161141).

It is not a de Polignac number, because 161139 - 2¹ = 161137 is a prime.

161139 is strictly pandigital in base 7.

It is not an unprimeable number, because it can be changed into a prime (161137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499 + ... + 755.

It is an arithmetic number, because the mean of its divisors is an integer number (15480).

2¹⁶¹¹³⁹ is an apocalyptic number.

161139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

161139 is a deficient number, since it is larger than the sum of its proper divisors (86541).

161139 is a wasteful number, since it uses less digits than its factorization.

161139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290.

The product of its digits is 162, while the sum is 21.

The square root of 161139 is about 401.4212251488. The cubic root of 161139 is about 54.4168695879.

It can be divided in two parts, 161 and 139, that added together give a triangular number (300 = T₂₄).

The spelling of 161139 in words is "one hundred sixty-one thousand, one hundred thirty-nine".