71115643 has 4 divisors (see below), whose sum is σ = 73409728. Its totient is φ = 68821560.

The previous prime is 71115631. The next prime is 71115661. The reversal of 71115643 is 34651117.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71115643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71115623) 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, 1146996 + ... + 1147057.

It is an arithmetic number, because the mean of its divisors is an integer number (18352432).

Almost surely, 2^71115643 is an apocalyptic number.

71115643 is a deficient number, since it is larger than the sum of its proper divisors (2294085).

71115643 is a wasteful number, since it uses less digits than its factorization.

71115643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2294084.

The product of its digits is 2520, while the sum is 28.

The square root of 71115643 is about 8433.0091307907. The cubic root of 71115643 is about 414.3064682939.

The spelling of 71115643 in words is "seventy-one million, one hundred fifteen thousand, six hundred forty-three".