71207891 has 4 divisors (see below), whose sum is σ = 71236800. Its totient is φ = 71178984.

The previous prime is 71207881. The next prime is 71207911. The reversal of 71207891 is 19870217.

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

It is a cyclic number.

It is not a de Polignac number, because 71207891 - 2¹⁰ = 71206867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71207831) 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, 10376 + ... + 15813.

It is an arithmetic number, because the mean of its divisors is an integer number (17809200).

Almost surely, 2^71207891 is an apocalyptic number.

71207891 is a deficient number, since it is larger than the sum of its proper divisors (28909).

71207891 is a wasteful number, since it uses less digits than its factorization.

71207891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28908.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 71207891 is about 8438.4768175305. The cubic root of 71207891 is about 414.4855307714.

The spelling of 71207891 in words is "seventy-one million, two hundred seven thousand, eight hundred ninety-one".