142217244517 has 2 divisors, whose sum is σ = 142217244518. Its totient is φ = 142217244516.

The previous prime is 142217244479. The next prime is 142217244563. The reversal of 142217244517 is 715442712241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102963332641 + 39253911876 = 320879^2 + 198126^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142217244517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 142217244517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142217244577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71108622258 + 71108622259.

It is an arithmetic number, because the mean of its divisors is an integer number (71108622259).

Almost surely, 2^142217244517 is an apocalyptic number.

It is an amenable number.

142217244517 is a deficient number, since it is larger than the sum of its proper divisors (1).

142217244517 is an equidigital number, since it uses as much as digits as its factorization.

142217244517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 125440, while the sum is 40.

Adding to 142217244517 its reverse (715442712241), we get a palindrome (857659956758).

The spelling of 142217244517 in words is "one hundred forty-two billion, two hundred seventeen million, two hundred forty-four thousand, five hundred seventeen".