142402181 has 2 divisors, whose sum is σ = 142402182. Its totient is φ = 142402180.

The previous prime is 142402171. The next prime is 142402199. The reversal of 142402181 is 181204241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140801956 + 1600225 = 11866^2 + 1265^2 .

It is a cyclic number.

It is not a de Polignac number, because 142402181 - 2¹⁴ = 142385797 is a prime.

It is a super-2 number, since 2×142402181² = 40556762307113522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142402171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71201090 + 71201091.

It is an arithmetic number, because the mean of its divisors is an integer number (71201091).

Almost surely, 2^142402181 is an apocalyptic number.

It is an amenable number.

142402181 is a deficient number, since it is larger than the sum of its proper divisors (1).

142402181 is an equidigital number, since it uses as much as digits as its factorization.

142402181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 142402181 is about 11933.2384958988. The cubic root of 142402181 is about 522.2024202357.

The spelling of 142402181 in words is "one hundred forty-two million, four hundred two thousand, one hundred eighty-one".