142828561 has 2 divisors, whose sum is σ = 142828562. Its totient is φ = 142828560.

The previous prime is 142828559. The next prime is 142828571. The reversal of 142828561 is 165828241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138650625 + 4177936 = 11775^2 + 2044^2 .

It is an emirp because it is prime and its reverse (165828241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142828561 - 2¹ = 142828559 is a prime.

Together with 142828559, it forms a pair of twin primes.

It is equal to p_8062885 and since 142828561 and 8062885 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 142828561.

It is not a weakly prime, because it can be changed into another prime (142828531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71414280 + 71414281.

It is an arithmetic number, because the mean of its divisors is an integer number (71414281).

Almost surely, 2^142828561 is an apocalyptic number.

It is an amenable number.

142828561 is a deficient number, since it is larger than the sum of its proper divisors (1).

142828561 is an equidigital number, since it uses as much as digits as its factorization.

142828561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30720, while the sum is 37.

The square root of 142828561 is about 11951.0903686651. The cubic root of 142828561 is about 522.7230929984.

The spelling of 142828561 in words is "one hundred forty-two million, eight hundred twenty-eight thousand, five hundred sixty-one".