7142857142857 has 2 divisors, whose sum is σ = 7142857142858. Its totient is φ = 7142857142856.

The previous prime is 7142857142777. The next prime is 7142857142881. The reversal of 7142857142857 is 7582417582417.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6327946522681 + 814910620176 = 2515541^2 + 902724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7142857142857 is a prime.

It is a super-3 number, since 3×7142857142857³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

7142857142857 is a modest number, since divided by 142857142857 gives 7 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 7142857142795 and 7142857142804.

It is not a weakly prime, because it can be changed into another prime (7142857142257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3571428571428 + 3571428571429.

It is an arithmetic number, because the mean of its divisors is an integer number (3571428571429).

Almost surely, 2^{7142857142857} is an apocalyptic number.

It is an amenable number.

7142857142857 is a deficient number, since it is larger than the sum of its proper divisors (1).

7142857142857 is an equidigital number, since it uses as much as digits as its factorization.

7142857142857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35123200, while the sum is 61.

It can be divided in two parts, 7 and 142857142857, that multiplied together give a palindrome (999999999999).

The spelling of 7142857142857 in words is "seven trillion, one hundred forty-two billion, eight hundred fifty-seven million, one hundred forty-two thousand, eight hundred fifty-seven".