142012181 has 2 divisors, whose sum is σ = 142012182. Its totient is φ = 142012180.

The previous prime is 142012139. The next prime is 142012183. The reversal of 142012181 is 181210241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133980625 + 8031556 = 11575^2 + 2834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142012181 is a prime.

It is a super-2 number, since 2×142012181² = 40334919104753522, which contains 22 as substring.

Together with 142012183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142012183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71006090 + 71006091.

It is an arithmetic number, because the mean of its divisors is an integer number (71006091).

Almost surely, 2^142012181 is an apocalyptic number.

It is an amenable number.

142012181 is a deficient number, since it is larger than the sum of its proper divisors (1).

142012181 is an equidigital number, since it uses as much as digits as its factorization.

142012181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 142012181 is about 11916.8863802589. The cubic root of 142012181 is about 521.7252619328.

The spelling of 142012181 in words is "one hundred forty-two million, twelve thousand, one hundred eighty-one".