71055809 has 12 divisors (see below), whose sum is σ = 81038832. Its totient is φ = 61782600.

The previous prime is 71055797. The next prime is 71055821. The reversal of 71055809 is 90855017.

It is an interprime number because it is at equal distance from previous prime (71055797) and next prime (71055821).

It is not a de Polignac number, because 71055809 - 2¹² = 71051713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71055899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 287 + ... + 11924.

It is an arithmetic number, because the mean of its divisors is an integer number (6753236).

Almost surely, 2^71055809 is an apocalyptic number.

It is an amenable number.

71055809 is a deficient number, since it is larger than the sum of its proper divisors (9983023).

71055809 is a wasteful number, since it uses less digits than its factorization.

71055809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12268 (or 12245 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 35.

The square root of 71055809 is about 8429.4607775349. The cubic root of 71055809 is about 414.1902417846.

The spelling of 71055809 in words is "seventy-one million, fifty-five thousand, eight hundred nine".