71278589 has 2 divisors, whose sum is σ = 71278590. Its totient is φ = 71278588.

The previous prime is 71278583. The next prime is 71278591. The reversal of 71278589 is 98587217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67732900 + 3545689 = 8230^2 + 1883^2 .

It is a cyclic number.

It is not a de Polignac number, because 71278589 - 2¹⁶ = 71213053 is a prime.

It is a Sophie Germain prime.

Together with 71278591, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71278583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35639294 + 35639295.

It is an arithmetic number, because the mean of its divisors is an integer number (35639295).

Almost surely, 2^71278589 is an apocalyptic number.

It is an amenable number.

71278589 is a deficient number, since it is larger than the sum of its proper divisors (1).

71278589 is an equidigital number, since it uses as much as digits as its factorization.

71278589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 47.

The square root of 71278589 is about 8442.6648044323. The cubic root of 71278589 is about 414.6226579220.

The spelling of 71278589 in words is "seventy-one million, two hundred seventy-eight thousand, five hundred eighty-nine".