81071202239 has 8 divisors (see below), whose sum is σ = 85629369840. Its totient is φ = 76542160896.

The previous prime is 81071202203. The next prime is 81071202241. The reversal of 81071202239 is 93220217018.

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

It is not a de Polignac number, because 81071202239 - 2²⁰ = 81070153663 is a prime.

It is a super-2 number, since 2×81071202239² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81071202199 and 81071202208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81071202269) 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, 7275842 + ... + 7286975.

It is an arithmetic number, because the mean of its divisors is an integer number (10703671230).

Almost surely, 2^81071202239 is an apocalyptic number.

81071202239 is a deficient number, since it is larger than the sum of its proper divisors (4558167601).

81071202239 is a wasteful number, since it uses less digits than its factorization.

81071202239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14563129.

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 81071202239 in words is "eighty-one billion, seventy-one million, two hundred two thousand, two hundred thirty-nine".