142866781 has 2 divisors, whose sum is σ = 142866782. Its totient is φ = 142866780.

The previous prime is 142866749. The next prime is 142866799. The reversal of 142866781 is 187668241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133194681 + 9672100 = 11541^2 + 3110^2 .

It is an emirp because it is prime and its reverse (187668241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142866781 - 2⁵ = 142866749 is a prime.

It is a super-2 number, since 2×142866781² = 40821834226603922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142866481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71433390 + 71433391.

It is an arithmetic number, because the mean of its divisors is an integer number (71433391).

Almost surely, 2^142866781 is an apocalyptic number.

It is an amenable number.

142866781 is a deficient number, since it is larger than the sum of its proper divisors (1).

142866781 is an equidigital number, since it uses as much as digits as its factorization.

142866781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 43.

The square root of 142866781 is about 11952.6892789865. The cubic root of 142866781 is about 522.7697146141.

The spelling of 142866781 in words is "one hundred forty-two million, eight hundred sixty-six thousand, seven hundred eighty-one".