71198891 has 4 divisors (see below), whose sum is σ = 71223384. Its totient is φ = 71174400.

The previous prime is 71198863. The next prime is 71198917. The reversal of 71198891 is 19889117.

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-71198891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71198801) 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, 7190 + ... + 13931.

It is an arithmetic number, because the mean of its divisors is an integer number (17805846).

Almost surely, 2^71198891 is an apocalyptic number.

71198891 is a deficient number, since it is larger than the sum of its proper divisors (24493).

71198891 is a wasteful number, since it uses less digits than its factorization.

71198891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24492.

The product of its digits is 36288, while the sum is 44.

The square root of 71198891 is about 8437.9435290834. The cubic root of 71198891 is about 414.4680676930.

The spelling of 71198891 in words is "seventy-one million, one hundred ninety-eight thousand, eight hundred ninety-one".