71100813 has 20 divisors (see below), whose sum is σ = 110605888. Its totient is φ = 40624920.

The previous prime is 71100811. The next prime is 71100829. The reversal of 71100813 is 31800117.

It is not a de Polignac number, because 71100813 - 2¹ = 71100811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

71100813 is a modest number, since divided by 813 gives 711 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 71100813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71100811) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2268 + ... + 12138.

Almost surely, 2^71100813 is an apocalyptic number.

It is an amenable number.

71100813 is a deficient number, since it is larger than the sum of its proper divisors (39505075).

71100813 is an frugal number, since it uses more digits than its factorization.

71100813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9902 (or 9881 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 71100813 is about 8432.1298021318. The cubic root of 71100813 is about 414.2776673540.

The spelling of 71100813 in words is "seventy-one million, one hundred thousand, eight hundred thirteen".