81322491115 has 8 divisors (see below), whose sum is σ = 100734956928. Its totient is φ = 62959347840.

The previous prime is 81322491097. The next prime is 81322491161. The reversal of 81322491115 is 51119422318.

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

It is a de Polignac number, because none of the positive numbers 2^k-81322491115 is a prime.

It is a super-2 number, since 2×81322491115² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262330462 + ... + 262330771.

It is an arithmetic number, because the mean of its divisors is an integer number (12591869616).

Almost surely, 2^81322491115 is an apocalyptic number.

81322491115 is a deficient number, since it is larger than the sum of its proper divisors (19412465813).

81322491115 is a wasteful number, since it uses less digits than its factorization.

81322491115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524661269.

The product of its digits is 17280, while the sum is 37.

The spelling of 81322491115 in words is "eighty-one billion, three hundred twenty-two million, four hundred ninety-one thousand, one hundred fifteen".