71247871 has 2 divisors, whose sum is σ = 71247872. Its totient is φ = 71247870.

The previous prime is 71247863. The next prime is 71247899. The reversal of 71247871 is 17874217.

It is a weak prime.

It is an emirp because it is prime and its reverse (17874217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71247871 - 2³ = 71247863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71247871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71247811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35623935 + 35623936.

It is an arithmetic number, because the mean of its divisors is an integer number (35623936).

Almost surely, 2^71247871 is an apocalyptic number.

71247871 is a deficient number, since it is larger than the sum of its proper divisors (1).

71247871 is an equidigital number, since it uses as much as digits as its factorization.

71247871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21952, while the sum is 37.

The square root of 71247871 is about 8440.8453960489. The cubic root of 71247871 is about 414.5630878649.

The spelling of 71247871 in words is "seventy-one million, two hundred forty-seven thousand, eight hundred seventy-one".