161739 has 6 divisors (see below), whose sum is σ = 233636. Its totient is φ = 107820.

The previous prime is 161731. The next prime is 161741. The reversal of 161739 is 937161.

It is not a de Polignac number, because 161739 - 2³ = 161731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8977 + ... + 8994.

2¹⁶¹⁷³⁹ is an apocalyptic number.

161739 is a deficient number, since it is larger than the sum of its proper divisors (71897).

161739 is a wasteful number, since it uses less digits than its factorization.

161739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17977 (or 17974 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 161739 is about 402.1678753953. The cubic root of 161739 is about 54.4843262169.

It can be divided in two parts, 161 and 739, that added together give a square (900 = 30²).

The spelling of 161739 in words is "one hundred sixty-one thousand, seven hundred thirty-nine".