71207089 has 4 divisors (see below), whose sum is σ = 71418724. Its totient is φ = 70995456.

The previous prime is 71207083. The next prime is 71207099. The reversal of 71207089 is 98070217.

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 36397089 + 34810000 = 6033^2 + 5900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71207089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71207083) 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, 105312 + ... + 105985.

It is an arithmetic number, because the mean of its divisors is an integer number (17854681).

Almost surely, 2^71207089 is an apocalyptic number.

It is an amenable number.

71207089 is a deficient number, since it is larger than the sum of its proper divisors (211635).

71207089 is a wasteful number, since it uses less digits than its factorization.

71207089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211634.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 71207089 is about 8438.4292969723. The cubic root of 71207089 is about 414.4839746768.

The spelling of 71207089 in words is "seventy-one million, two hundred seven thousand, eighty-nine".