71718589 has 2 divisors, whose sum is σ = 71718590. Its totient is φ = 71718588.

The previous prime is 71718547. The next prime is 71718601. The reversal of 71718589 is 98581717.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59059225 + 12659364 = 7685^2 + 3558^2 .

It is a cyclic number.

It is not a de Polignac number, because 71718589 - 2⁹ = 71718077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71718089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35859294 + 35859295.

It is an arithmetic number, because the mean of its divisors is an integer number (35859295).

Almost surely, 2^71718589 is an apocalyptic number.

It is an amenable number.

71718589 is a deficient number, since it is larger than the sum of its proper divisors (1).

71718589 is an equidigital number, since it uses as much as digits as its factorization.

71718589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 46.

The square root of 71718589 is about 8468.6828373721. The cubic root of 71718589 is about 415.4740583596.

It can be divided in two parts, 717 and 18589, that added together give a triangular number (19306 = T₁₉₆).

The spelling of 71718589 in words is "seventy-one million, seven hundred eighteen thousand, five hundred eighty-nine".