71066839 has 2 divisors, whose sum is σ = 71066840. Its totient is φ = 71066838.

The previous prime is 71066837. The next prime is 71066881. The reversal of 71066839 is 93866017.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71066839 - 2¹ = 71066837 is a prime.

Together with 71066837, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71066837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35533419 + 35533420.

It is an arithmetic number, because the mean of its divisors is an integer number (35533420).

Almost surely, 2^71066839 is an apocalyptic number.

71066839 is a deficient number, since it is larger than the sum of its proper divisors (1).

71066839 is an equidigital number, since it uses as much as digits as its factorization.

71066839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 71066839 is about 8430.1150051467. The cubic root of 71066839 is about 414.2116722726.

The spelling of 71066839 in words is "seventy-one million, sixty-six thousand, eight hundred thirty-nine".