71123539 has 2 divisors, whose sum is σ = 71123540. Its totient is φ = 71123538.

The previous prime is 71123537. The next prime is 71123543. The reversal of 71123539 is 93532117.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71123539 - 2¹ = 71123537 is a prime.

Together with 71123537, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 71123539.

It is not a weakly prime, because it can be changed into another prime (71123531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35561769 + 35561770.

It is an arithmetic number, because the mean of its divisors is an integer number (35561770).

Almost surely, 2^71123539 is an apocalyptic number.

71123539 is a deficient number, since it is larger than the sum of its proper divisors (1).

71123539 is an equidigital number, since it uses as much as digits as its factorization.

71123539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 31.

The square root of 71123539 is about 8433.4772780864. The cubic root of 71123539 is about 414.3218012673.

The spelling of 71123539 in words is "seventy-one million, one hundred twenty-three thousand, five hundred thirty-nine".