142001 has 4 divisors (see below), whose sum is σ = 150372. Its totient is φ = 133632.

The previous prime is 141991. The next prime is 142007. The reversal of 142001 is 100241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100241 = 59 ⋅1699.

It can be written as a sum of positive squares in 2 ways, for example, as 102400 + 39601 = 320^2 + 199^2 .

It is a cyclic number.

It is not a de Polignac number, because 142001 - 2⁶ = 141937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 142001.

It is not an unprimeable number, because it can be changed into a prime (142007) 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, 4160 + ... + 4193.

It is an arithmetic number, because the mean of its divisors is an integer number (37593).

2¹⁴²⁰⁰¹ is an apocalyptic number.

It is an amenable number.

142001 is a deficient number, since it is larger than the sum of its proper divisors (8371).

142001 is an equidigital number, since it uses as much as digits as its factorization.

142001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8370.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 142001 is about 376.8302004882. The cubic root of 142001 is about 52.1711569297.

Adding to 142001 its reverse (100241), we get a palindrome (242242).

The spelling of 142001 in words is "one hundred forty-two thousand, one", and thus it is an iban number.