142778287 has 2 divisors, whose sum is σ = 142778288. Its totient is φ = 142778286.

The previous prime is 142778269. The next prime is 142778299. The reversal of 142778287 is 782877241.

It is a strong prime.

It is an emirp because it is prime and its reverse (782877241) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142778287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142778267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71389143 + 71389144.

It is an arithmetic number, because the mean of its divisors is an integer number (71389144).

Almost surely, 2^142778287 is an apocalyptic number.

142778287 is a deficient number, since it is larger than the sum of its proper divisors (1).

142778287 is an equidigital number, since it uses as much as digits as its factorization.

142778287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 351232, while the sum is 46.

The square root of 142778287 is about 11948.9868608179. The cubic root of 142778287 is about 522.6617549753.

The spelling of 142778287 in words is "one hundred forty-two million, seven hundred seventy-eight thousand, two hundred eighty-seven".