71884289 has 2 divisors, whose sum is σ = 71884290. Its totient is φ = 71884288.

The previous prime is 71884237. The next prime is 71884333. The reversal of 71884289 is 98248817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64128064 + 7756225 = 8008^2 + 2785^2 .

It is an emirp because it is prime and its reverse (98248817) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71884289 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (71884489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35942144 + 35942145.

It is an arithmetic number, because the mean of its divisors is an integer number (35942145).

Almost surely, 2^71884289 is an apocalyptic number.

It is an amenable number.

71884289 is a deficient number, since it is larger than the sum of its proper divisors (1).

71884289 is an equidigital number, since it uses as much as digits as its factorization.

71884289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 47.

The square root of 71884289 is about 8478.4602965397. The cubic root of 71884289 is about 415.7937853223.

The spelling of 71884289 in words is "seventy-one million, eight hundred eighty-four thousand, two hundred eighty-nine".