71139533 has 2 divisors, whose sum is σ = 71139534. Its totient is φ = 71139532.

The previous prime is 71139479. The next prime is 71139539. The reversal of 71139533 is 33593117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37185604 + 33953929 = 6098^2 + 5827^2 .

It is an emirp because it is prime and its reverse (33593117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71139533 - 2¹² = 71135437 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71139533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71139539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35569766 + 35569767.

It is an arithmetic number, because the mean of its divisors is an integer number (35569767).

Almost surely, 2^71139533 is an apocalyptic number.

It is an amenable number.

71139533 is a deficient number, since it is larger than the sum of its proper divisors (1).

71139533 is an equidigital number, since it uses as much as digits as its factorization.

71139533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8505, while the sum is 32.

The square root of 71139533 is about 8434.4254694674. The cubic root of 71139533 is about 414.3528559942.

The spelling of 71139533 in words is "seventy-one million, one hundred thirty-nine thousand, five hundred thirty-three".