71321447 has 4 divisors (see below), whose sum is σ = 71501496. Its totient is φ = 71141400.

The previous prime is 71321441. The next prime is 71321473. The reversal of 71321447 is 74412317.

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 71321447 - 2⁴ = 71321431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71321441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89429 + ... + 90222.

It is an arithmetic number, because the mean of its divisors is an integer number (17875374).

Almost surely, 2^71321447 is an apocalyptic number.

71321447 is a deficient number, since it is larger than the sum of its proper divisors (180049).

71321447 is a wasteful number, since it uses less digits than its factorization.

71321447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180048.

The product of its digits is 4704, while the sum is 29.

The square root of 71321447 is about 8445.2026026615. The cubic root of 71321447 is about 414.7057419532.

The spelling of 71321447 in words is "seventy-one million, three hundred twenty-one thousand, four hundred forty-seven".