81716095831 has 8 divisors (see below), whose sum is σ = 86042972720. Its totient is φ = 77391821952.

The previous prime is 81716095823. The next prime is 81716095843. The reversal of 81716095831 is 13859061718.

It is a happy number.

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 81716095831 - 2³ = 81716095823 is a prime.

It is a super-2 number, since 2×81716095831² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81716095871) 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, 586140 + ... + 712033.

It is an arithmetic number, because the mean of its divisors is an integer number (10755371590).

Almost surely, 2^81716095831 is an apocalyptic number.

81716095831 is a deficient number, since it is larger than the sum of its proper divisors (4326876889).

81716095831 is a wasteful number, since it uses less digits than its factorization.

81716095831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301505.

The product of its (nonzero) digits is 362880, while the sum is 49.

The spelling of 81716095831 in words is "eighty-one billion, seven hundred sixteen million, ninety-five thousand, eight hundred thirty-one".