142391 has 2 divisors, whose sum is σ = 142392. Its totient is φ = 142390.

The previous prime is 142381. The next prime is 142403. The reversal of 142391 is 193241.

142391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 142391 - 2⁶ = 142327 is a prime.

It is a Sophie Germain prime.

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 142391.

It is not a weakly prime, because it can be changed into another prime (142381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71195 + 71196.

It is an arithmetic number, because the mean of its divisors is an integer number (71196).

2¹⁴²³⁹¹ is an apocalyptic number.

142391 is a deficient number, since it is larger than the sum of its proper divisors (1).

142391 is an equidigital number, since it uses as much as digits as its factorization.

142391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 20.

The square root of 142391 is about 377.3473201177. The cubic root of 142391 is about 52.2188752612.

The spelling of 142391 in words is "one hundred forty-two thousand, three hundred ninety-one".