80142857 has 2 divisors, whose sum is σ = 80142858. Its totient is φ = 80142856.

The previous prime is 80142847. The next prime is 80142869. The reversal of 80142857 is 75824108.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49716601 + 30426256 = 7051^2 + 5516^2 .

It is a cyclic number.

It is not a de Polignac number, because 80142857 - 2¹² = 80138761 is a prime.

It is a Chen prime.

80142857 is a modest number, since divided by 142857 gives 80 as remainder.

It is not a weakly prime, because it can be changed into another prime (80142847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40071428 + 40071429.

It is an arithmetic number, because the mean of its divisors is an integer number (40071429).

Almost surely, 2^80142857 is an apocalyptic number.

It is an amenable number.

80142857 is a deficient number, since it is larger than the sum of its proper divisors (1).

80142857 is an equidigital number, since it uses as much as digits as its factorization.

80142857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 80142857 is about 8952.2542971030. The cubic root of 80142857 is about 431.1432655549.

The spelling of 80142857 in words is "eighty million, one hundred forty-two thousand, eight hundred fifty-seven".