71000087 has 2 divisors, whose sum is σ = 71000088. Its totient is φ = 71000086.

The previous prime is 71000081. The next prime is 71000099. The reversal of 71000087 is 78000017.

It is a weak prime.

It is an emirp because it is prime and its reverse (78000017) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71000087 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71000081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35500043 + 35500044.

It is an arithmetic number, because the mean of its divisors is an integer number (35500044).

Almost surely, 2^71000087 is an apocalyptic number.

71000087 is a deficient number, since it is larger than the sum of its proper divisors (1).

71000087 is an equidigital number, since it uses as much as digits as its factorization.

71000087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 71000087 is about 8426.1549356750. The cubic root of 71000087 is about 414.0819440742.

The spelling of 71000087 in words is "seventy-one million, eighty-seven", and thus it is an aban number and an uban number.