71136813 has 8 divisors (see below), whose sum is σ = 103471776. Its totient is φ = 43113200.

The previous prime is 71136809. The next prime is 71136827. The reversal of 71136813 is 31863117.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71136813 - 2² = 71136809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71136833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1077798 + ... + 1077863.

It is an arithmetic number, because the mean of its divisors is an integer number (12933972).

Almost surely, 2^71136813 is an apocalyptic number.

It is an amenable number.

71136813 is a deficient number, since it is larger than the sum of its proper divisors (32334963).

71136813 is a wasteful number, since it uses less digits than its factorization.

71136813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155675.

The product of its digits is 3024, while the sum is 30.

The square root of 71136813 is about 8434.2642239854. The cubic root of 71136813 is about 414.3475750386.

The spelling of 71136813 in words is "seventy-one million, one hundred thirty-six thousand, eight hundred thirteen".