71709389 has 2 divisors, whose sum is σ = 71709390. Its totient is φ = 71709388.

The previous prime is 71709359. The next prime is 71709397. The reversal of 71709389 is 98390717.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37393225 + 34316164 = 6115^2 + 5858^2 .

It is a cyclic number.

It is not a de Polignac number, because 71709389 - 2⁸ = 71709133 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71709359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35854694 + 35854695.

It is an arithmetic number, because the mean of its divisors is an integer number (35854695).

Almost surely, 2^71709389 is an apocalyptic number.

It is an amenable number.

71709389 is a deficient number, since it is larger than the sum of its proper divisors (1).

71709389 is an equidigital number, since it uses as much as digits as its factorization.

71709389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 71709389 is about 8468.1396422119. The cubic root of 71709389 is about 415.4562920462.

The spelling of 71709389 in words is "seventy-one million, seven hundred nine thousand, three hundred eighty-nine".