161829 has 6 divisors (see below), whose sum is σ = 233766. Its totient is φ = 107880.

The previous prime is 161807. The next prime is 161831. The reversal of 161829 is 928161.

It can be written as a sum of positive squares in only one way, i.e., 161604 + 225 = 402^2 + 15^2 .

It is not a de Polignac number, because 161829 - 2⁸ = 161573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161839) 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, 8982 + ... + 8999.

It is an arithmetic number, because the mean of its divisors is an integer number (38961).

2¹⁶¹⁸²⁹ is an apocalyptic number.

It is an amenable number.

161829 is a deficient number, since it is larger than the sum of its proper divisors (71937).

161829 is a wasteful number, since it uses less digits than its factorization.

161829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17987 (or 17984 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 161829 is about 402.2797534055. The cubic root of 161829 is about 54.4944303149.

It can be divided in two parts, 161 and 829, that added together give a triangular number (990 = T₄₄).

The spelling of 161829 in words is "one hundred sixty-one thousand, eight hundred twenty-nine".