142181 has 4 divisors (see below), whose sum is σ = 153132. Its totient is φ = 131232.

The previous prime is 142169. The next prime is 142183. The reversal of 142181 is 181241.

142181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 181241 = 19 ⋅9539.

It can be written as a sum of positive squares in 2 ways, for example, as 84100 + 58081 = 290^2 + 241^2 .

It is a cyclic number.

It is not a de Polignac number, because 142181 - 2¹⁰ = 141157 is a prime.

It is a super-2 number, since 2×142181² = 40430873522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 142181.

It is not an unprimeable number, because it can be changed into a prime (142183) 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, 5456 + ... + 5481.

It is an arithmetic number, because the mean of its divisors is an integer number (38283).

2¹⁴²¹⁸¹ is an apocalyptic number.

It is an amenable number.

142181 is a deficient number, since it is larger than the sum of its proper divisors (10951).

142181 is a wasteful number, since it uses less digits than its factorization.

142181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10950.

The product of its digits is 64, while the sum is 17.

The square root of 142181 is about 377.0689592104. The cubic root of 142181 is about 52.1931916175.

Subtracting 142181 from its reverse (181241), we obtain a triangular number (39060 = T₂₇₉).

It can be divided in two parts, 142 and 181, that added together give a palindrome (323).

The spelling of 142181 in words is "one hundred forty-two thousand, one hundred eighty-one".