71039557 has 4 divisors (see below), whose sum is σ = 72379980. Its totient is φ = 69699136.

The previous prime is 71039539. The next prime is 71039561. The reversal of 71039557 is 75593017.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27029601 + 44009956 = 5199^2 + 6634^2 .

It is a cyclic number.

It is not a de Polignac number, because 71039557 - 2²³ = 62650949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71039587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 670132 + ... + 670237.

It is an arithmetic number, because the mean of its divisors is an integer number (18094995).

Almost surely, 2^71039557 is an apocalyptic number.

It is an amenable number.

71039557 is a deficient number, since it is larger than the sum of its proper divisors (1340423).

71039557 is a wasteful number, since it uses less digits than its factorization.

71039557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340422.

The product of its (nonzero) digits is 33075, while the sum is 37.

The square root of 71039557 is about 8428.4967224292. The cubic root of 71039557 is about 414.1586612886.

The spelling of 71039557 in words is "seventy-one million, thirty-nine thousand, five hundred fifty-seven".