71199845 has 4 divisors (see below), whose sum is σ = 85439820. Its totient is φ = 56959872.

The previous prime is 71199811. The next prime is 71199851. The reversal of 71199845 is 54899117.

It is a Cunningham number, because it is equal to 8438²+1.

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 25623844 + 45576001 = 5062^2 + 6751^2 .

It is a cyclic number.

It is not a de Polignac number, because 71199845 - 2¹⁰ = 71198821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71199796 and 71199805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7119980 + ... + 7119989.

It is an arithmetic number, because the mean of its divisors is an integer number (21359955).

Almost surely, 2^71199845 is an apocalyptic number.

It is an amenable number.

71199845 is a deficient number, since it is larger than the sum of its proper divisors (14239975).

71199845 is a wasteful number, since it uses less digits than its factorization.

71199845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14239974.

The product of its digits is 90720, while the sum is 44.

The square root of 71199845 is about 8438.0000592557. Note that the first 4 decimals coincide. The cubic root of 71199845 is about 414.4699188491.

The spelling of 71199845 in words is "seventy-one million, one hundred ninety-nine thousand, eight hundred forty-five".