71216947 has 4 divisors (see below), whose sum is σ = 74313360. Its totient is φ = 68120536.

The previous prime is 71216941. The next prime is 71216963. The reversal of 71216947 is 74961217.

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 71216947 - 2¹⁹ = 70692659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71216941) 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, 1548172 + ... + 1548217.

It is an arithmetic number, because the mean of its divisors is an integer number (18578340).

Almost surely, 2^71216947 is an apocalyptic number.

71216947 is a deficient number, since it is larger than the sum of its proper divisors (3096413).

71216947 is a wasteful number, since it uses less digits than its factorization.

71216947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096412.

The product of its digits is 21168, while the sum is 37.

The square root of 71216947 is about 8439.0133902015. The cubic root of 71216947 is about 414.5031010238.

The spelling of 71216947 in words is "seventy-one million, two hundred sixteen thousand, nine hundred forty-seven".