71389679 has 2 divisors, whose sum is σ = 71389680. Its totient is φ = 71389678.

The previous prime is 71389673. The next prime is 71389691. The reversal of 71389679 is 97698317.

It is a weak prime.

It is an emirp because it is prime and its reverse (97698317) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71389679 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71389673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35694839 + 35694840.

It is an arithmetic number, because the mean of its divisors is an integer number (35694840).

Almost surely, 2^71389679 is an apocalyptic number.

71389679 is a deficient number, since it is larger than the sum of its proper divisors (1).

71389679 is an equidigital number, since it uses as much as digits as its factorization.

71389679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 50.

The square root of 71389679 is about 8449.2413268885. The cubic root of 71389679 is about 414.8379470830.

The spelling of 71389679 in words is "seventy-one million, three hundred eighty-nine thousand, six hundred seventy-nine".