161642 has 8 divisors (see below), whose sum is σ = 261156. Its totient is φ = 74592.

The previous prime is 161641. The next prime is 161659. The reversal of 161642 is 246161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 160801 + 841 = 401^2 + 29^2 .

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

It is a super-2 number, since 2×161642² = 52256272328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161641) 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 3 ways as a sum of consecutive naturals, for example, 3083 + ... + 3134.

2¹⁶¹⁶⁴² is an apocalyptic number.

161642 is a deficient number, since it is larger than the sum of its proper divisors (99514).

161642 is a wasteful number, since it uses less digits than its factorization.

161642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6232.

The product of its digits is 288, while the sum is 20.

The square root of 161642 is about 402.0472609035. The cubic root of 161642 is about 54.4734320468.

The spelling of 161642 in words is "one hundred sixty-one thousand, six hundred forty-two".