71389691 has 2 divisors, whose sum is σ = 71389692. Its totient is φ = 71389690.

The previous prime is 71389679. The next prime is 71389697. The reversal of 71389691 is 19698317.

It is a strong prime.

It is an emirp because it is prime and its reverse (19698317) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71389691 - 2²⁶ = 4280827 is a prime.

It is not a weakly prime, because it can be changed into another prime (71389697) 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, 35694845 + 35694846.

It is an arithmetic number, because the mean of its divisors is an integer number (35694846).

Almost surely, 2^71389691 is an apocalyptic number.

71389691 is a deficient number, since it is larger than the sum of its proper divisors (1).

71389691 is an equidigital number, since it uses as much as digits as its factorization.

71389691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 71389691 is about 8449.2420370114. The cubic root of 71389691 is about 414.8379703266.

The spelling of 71389691 in words is "seventy-one million, three hundred eighty-nine thousand, six hundred ninety-one".