142142381 has 2 divisors, whose sum is σ = 142142382. Its totient is φ = 142142380.

The previous prime is 142142353. The next prime is 142142479. The reversal of 142142381 is 183241241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119006281 + 23136100 = 10909^2 + 4810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142142381 is a prime.

It is a super-2 number, since 2×142142381² = 40408912952698322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 142142381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142142681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71071190 + 71071191.

It is an arithmetic number, because the mean of its divisors is an integer number (71071191).

Almost surely, 2^142142381 is an apocalyptic number.

It is an amenable number.

142142381 is a deficient number, since it is larger than the sum of its proper divisors (1).

142142381 is an equidigital number, since it uses as much as digits as its factorization.

142142381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 26.

The square root of 142142381 is about 11922.3479650612. The cubic root of 142142381 is about 521.8846564291.

The spelling of 142142381 in words is "one hundred forty-two million, one hundred forty-two thousand, three hundred eighty-one".