142285681 has 2 divisors, whose sum is σ = 142285682. Its totient is φ = 142285680.

The previous prime is 142285651. The next prime is 142285721. The reversal of 142285681 is 186582241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82083600 + 60202081 = 9060^2 + 7759^2 .

It is an emirp because it is prime and its reverse (186582241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142285681 - 2⁷ = 142285553 is a prime.

It is a super-2 number, since 2×142285681² = 40490430035267522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 142285681.

It is not a weakly prime, because it can be changed into another prime (142285601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71142840 + 71142841.

It is an arithmetic number, because the mean of its divisors is an integer number (71142841).

Almost surely, 2^142285681 is an apocalyptic number.

It is an amenable number.

142285681 is a deficient number, since it is larger than the sum of its proper divisors (1).

142285681 is an equidigital number, since it uses as much as digits as its factorization.

142285681 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 142285681 is about 11928.3561734214. The cubic root of 142285681 is about 522.0599758356.

The spelling of 142285681 in words is "one hundred forty-two million, two hundred eighty-five thousand, six hundred eighty-one".