142435781 has 2 divisors, whose sum is σ = 142435782. Its totient is φ = 142435780.

The previous prime is 142435771. The next prime is 142435801. The reversal of 142435781 is 187534241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135722500 + 6713281 = 11650^2 + 2591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142435781 is a prime.

It is a super-2 number, since 2×142435781² = 40575903418159922, 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 (142435721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71217890 + 71217891.

It is an arithmetic number, because the mean of its divisors is an integer number (71217891).

Almost surely, 2^142435781 is an apocalyptic number.

It is an amenable number.

142435781 is a deficient number, since it is larger than the sum of its proper divisors (1).

142435781 is an equidigital number, since it uses as much as digits as its factorization.

142435781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 35.

The square root of 142435781 is about 11934.6462452810. The cubic root of 142435781 is about 522.2434884772.

The spelling of 142435781 in words is "one hundred forty-two million, four hundred thirty-five thousand, seven hundred eighty-one".