161242 has 4 divisors (see below), whose sum is σ = 241866. Its totient is φ = 80620.

The previous prime is 161237. The next prime is 161263. The reversal of 161242 is 242161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 160801 + 441 = 401^2 + 21^2 .

It is an unprimeable number.

161242 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 40309 + ... + 40312.

2¹⁶¹²⁴² is an apocalyptic number.

161242 is a deficient number, since it is larger than the sum of its proper divisors (80624).

161242 is an equidigital number, since it uses as much as digits as its factorization.

161242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80623.

The product of its digits is 96, while the sum is 16.

The square root of 161242 is about 401.5494988168. The cubic root of 161242 is about 54.4284615339.

The spelling of 161242 in words is "one hundred sixty-one thousand, two hundred forty-two".