71321105 has 4 divisors (see below), whose sum is σ = 85585332. Its totient is φ = 57056880.

The previous prime is 71321077. The next prime is 71321113. The reversal of 71321105 is 50112317.

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 19149376 + 52171729 = 4376^2 + 7223^2 .

It is a de Polignac number, because none of the positive numbers 2^k-71321105 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7132106 + ... + 7132115.

It is an arithmetic number, because the mean of its divisors is an integer number (21396333).

Almost surely, 2^71321105 is an apocalyptic number.

It is an amenable number.

71321105 is a deficient number, since it is larger than the sum of its proper divisors (14264227).

71321105 is a wasteful number, since it uses less digits than its factorization.

71321105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14264226.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 71321105 is about 8445.1823544551. The cubic root of 71321105 is about 414.7050790877.

The spelling of 71321105 in words is "seventy-one million, three hundred twenty-one thousand, one hundred five".