142091 has 4 divisors (see below), whose sum is σ = 143184. Its totient is φ = 141000.

The previous prime is 142067. The next prime is 142097. The reversal of 142091 is 190241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 190241 = 103 ⋅1847.

It is a cyclic number.

It is not a de Polignac number, because 142091 - 2¹⁰ = 141067 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 142091.

It is not an unprimeable number, because it can be changed into a prime (142097) 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, 320 + ... + 621.

It is an arithmetic number, because the mean of its divisors is an integer number (35796).

2¹⁴²⁰⁹¹ is an apocalyptic number.

142091 is a deficient number, since it is larger than the sum of its proper divisors (1093).

142091 is an equidigital number, since it uses as much as digits as its factorization.

142091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 142091 is about 376.9495987529. The cubic root of 142091 is about 52.1821765997.

The spelling of 142091 in words is "one hundred forty-two thousand, ninety-one".