71243789 has 2 divisors, whose sum is σ = 71243790. Its totient is φ = 71243788.

The previous prime is 71243779. The next prime is 71243801. The reversal of 71243789 is 98734217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58782889 + 12460900 = 7667^2 + 3530^2 .

It is a cyclic number.

It is not a de Polignac number, because 71243789 - 2⁸ = 71243533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71243779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35621894 + 35621895.

It is an arithmetic number, because the mean of its divisors is an integer number (35621895).

Almost surely, 2^71243789 is an apocalyptic number.

It is an amenable number.

71243789 is a deficient number, since it is larger than the sum of its proper divisors (1).

71243789 is an equidigital number, since it uses as much as digits as its factorization.

71243789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 71243789 is about 8440.6035921609. The cubic root of 71243789 is about 414.5551705343. Note that the first 3 decimals are identical.

The spelling of 71243789 in words is "seventy-one million, two hundred forty-three thousand, seven hundred eighty-nine".