161289 has 6 divisors (see below), whose sum is σ = 232986. Its totient is φ = 107520.

The previous prime is 161281. The next prime is 161303. The reversal of 161289 is 982161.

It can be written as a sum of positive squares in only one way, i.e., 90000 + 71289 = 300^2 + 267^2 .

It is not a de Polignac number, because 161289 - 2³ = 161281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161281) 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, 8952 + ... + 8969.

It is an arithmetic number, because the mean of its divisors is an integer number (38831).

2¹⁶¹²⁸⁹ is an apocalyptic number.

It is an amenable number.

161289 is a deficient number, since it is larger than the sum of its proper divisors (71697).

161289 is a wasteful number, since it uses less digits than its factorization.

161289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17927 (or 17924 counting only the distinct ones).

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

The square root of 161289 is about 401.6080178482. The cubic root of 161289 is about 54.4337494225.

The spelling of 161289 in words is "one hundred sixty-one thousand, two hundred eighty-nine".