71207989 has 2 divisors, whose sum is σ = 71207990. Its totient is φ = 71207988.

The previous prime is 71207933. The next prime is 71207999. The reversal of 71207989 is 98970217.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56881764 + 14326225 = 7542^2 + 3785^2 .

It is an emirp because it is prime and its reverse (98970217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71207989 - 2⁷ = 71207861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71207999) 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, 35603994 + 35603995.

It is an arithmetic number, because the mean of its divisors is an integer number (35603995).

Almost surely, 2^71207989 is an apocalyptic number.

It is an amenable number.

71207989 is a deficient number, since it is larger than the sum of its proper divisors (1).

71207989 is an equidigital number, since it uses as much as digits as its factorization.

71207989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 71207989 is about 8438.4826242637. The cubic root of 71207989 is about 414.4857209169.

The spelling of 71207989 in words is "seventy-one million, two hundred seven thousand, nine hundred eighty-nine".