161239 has 8 divisors (see below), whose sum is σ = 176960. Its totient is φ = 146016.

The previous prime is 161237. The next prime is 161263. The reversal of 161239 is 932161.

161239 = 1² + 2² + ... + 78².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161239 - 2¹ = 161237 is a prime.

161239 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 949 + ... + 1105.

It is an arithmetic number, because the mean of its divisors is an integer number (22120).

2¹⁶¹²³⁹ is an apocalyptic number.

161239 is a deficient number, since it is larger than the sum of its proper divisors (15721).

161239 is a wasteful number, since it uses less digits than its factorization.

161239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249.

The product of its digits is 324, while the sum is 22.

The square root of 161239 is about 401.5457632699. The cubic root of 161239 is about 54.4281239743.

It can be divided in two parts, 161 and 239, that added together give a square (400 = 20²).

The spelling of 161239 in words is "one hundred sixty-one thousand, two hundred thirty-nine".