81312098794 has 8 divisors (see below), whose sum is σ = 124035405120. Its totient is φ = 39966963756.

The previous prime is 81312098783. The next prime is 81312098797. The reversal of 81312098794 is 49789021318.

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

It is a super-2 number, since 2×81312098794² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81312098797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344542674 + ... + 344542909.

It is an arithmetic number, because the mean of its divisors is an integer number (15504425640).

Almost surely, 2^81312098794 is an apocalyptic number.

81312098794 is a deficient number, since it is larger than the sum of its proper divisors (42723306326).

81312098794 is a wasteful number, since it uses less digits than its factorization.

81312098794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689085644.

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 81312098794 in words is "eighty-one billion, three hundred twelve million, ninety-eight thousand, seven hundred ninety-four".