81090174139 has 8 divisors (see below), whose sum is σ = 90144908672. Its totient is φ = 72437872320.

The previous prime is 81090174133. The next prime is 81090174149. The reversal of 81090174139 is 93147109018.

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-81090174139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81090174095 and 81090174104.

It is not an unprimeable number, because it can be changed into a prime (81090174133) 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, 100607754 + ... + 100608559.

It is an arithmetic number, because the mean of its divisors is an integer number (11268113584).

Almost surely, 2^81090174139 is an apocalyptic number.

81090174139 is a deficient number, since it is larger than the sum of its proper divisors (9054734533).

81090174139 is a wasteful number, since it uses less digits than its factorization.

81090174139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201216357.

The product of its (nonzero) digits is 54432, while the sum is 43.

The spelling of 81090174139 in words is "eighty-one billion, ninety million, one hundred seventy-four thousand, one hundred thirty-nine".