71215055 has 4 divisors (see below), whose sum is σ = 85458072. Its totient is φ = 56972040.

The previous prime is 71215049. The next prime is 71215139. The reversal of 71215055 is 55051217.

It is a happy number.

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

It is not a de Polignac number, because 71215055 - 2⁸ = 71214799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7121501 + ... + 7121510.

It is an arithmetic number, because the mean of its divisors is an integer number (21364518).

Almost surely, 2^71215055 is an apocalyptic number.

71215055 is a deficient number, since it is larger than the sum of its proper divisors (14243017).

71215055 is a wasteful number, since it uses less digits than its factorization.

71215055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14243016.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 71215055 is about 8438.9012910449. The cubic root of 71215055 is about 414.4994303301.

The spelling of 71215055 in words is "seventy-one million, two hundred fifteen thousand, fifty-five".