71712857 has 2 divisors, whose sum is σ = 71712858. Its totient is φ = 71712856.

The previous prime is 71712829. The next prime is 71712871. The reversal of 71712857 is 75821717.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68740681 + 2972176 = 8291^2 + 1724^2 .

It is a cyclic number.

It is not a de Polignac number, because 71712857 - 2²² = 67518553 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71712857.

It is not a weakly prime, because it can be changed into another prime (71712877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35856428 + 35856429.

It is an arithmetic number, because the mean of its divisors is an integer number (35856429).

Almost surely, 2^71712857 is an apocalyptic number.

It is an amenable number.

71712857 is a deficient number, since it is larger than the sum of its proper divisors (1).

71712857 is an equidigital number, since it uses as much as digits as its factorization.

71712857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27440, while the sum is 38.

The square root of 71712857 is about 8468.3444072617. The cubic root of 71712857 is about 415.4629893523.

The spelling of 71712857 in words is "seventy-one million, seven hundred twelve thousand, eight hundred fifty-seven".