142161 has 4 divisors (see below), whose sum is σ = 189552. Its totient is φ = 94772.

The previous prime is 142159. The next prime is 142169. The reversal of 142161 is 161241.

142161 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 142161 - 2¹ = 142159 is a prime.

It is an Ulam number.

It is a D-number.

142161 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 142161.

It is not an unprimeable number, because it can be changed into a prime (142169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23691 + ... + 23696.

It is an arithmetic number, because the mean of its divisors is an integer number (47388).

2¹⁴²¹⁶¹ is an apocalyptic number.

It is an amenable number.

142161 is a deficient number, since it is larger than the sum of its proper divisors (47391).

142161 is an equidigital number, since it uses as much as digits as its factorization.

142161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47390.

The product of its digits is 48, while the sum is 15.

The square root of 142161 is about 377.0424379297. The cubic root of 142161 is about 52.1907442376.

It can be divided in two parts, 142 and 161, that added together give a palindrome (303).

The spelling of 142161 in words is "one hundred forty-two thousand, one hundred sixty-one".