81108486313 has 8 divisors (see below), whose sum is σ = 82959998400. Its totient is φ = 79272867408.

The previous prime is 81108486307. The next prime is 81108486383. The reversal of 81108486313 is 31368480118.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81108486313 is a prime.

It is a super-2 number, since 2×81108486313² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81108486313.

It is not an unprimeable number, because it can be changed into a prime (81108486383) 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, 3962973 + ... + 3983386.

It is an arithmetic number, because the mean of its divisors is an integer number (10369999800).

Almost surely, 2^81108486313 is an apocalyptic number.

It is an amenable number.

81108486313 is a deficient number, since it is larger than the sum of its proper divisors (1851512087).

81108486313 is a wasteful number, since it uses less digits than its factorization.

81108486313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7946591.

The product of its (nonzero) digits is 110592, while the sum is 43.

The spelling of 81108486313 in words is "eighty-one billion, one hundred eight million, four hundred eighty-six thousand, three hundred thirteen".