142381 has 2 divisors, whose sum is σ = 142382. Its totient is φ = 142380.

The previous prime is 142369. The next prime is 142391. The reversal of 142381 is 183241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122500 + 19881 = 350^2 + 141^2 .

It is a cyclic number.

It is not a de Polignac number, because 142381 - 2¹¹ = 140333 is a prime.

It is a super-2 number, since 2×142381² = 40544698322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71190 + 71191.

It is an arithmetic number, because the mean of its divisors is an integer number (71191).

2¹⁴²³⁸¹ is an apocalyptic number.

It is an amenable number.

142381 is a deficient number, since it is larger than the sum of its proper divisors (1).

142381 is an equidigital number, since it uses as much as digits as its factorization.

142381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 19.

The square root of 142381 is about 377.3340694928. The cubic root of 142381 is about 52.2176528034.

The spelling of 142381 in words is "one hundred forty-two thousand, three hundred eighty-one".