81381134054 has 16 divisors (see below), whose sum is σ = 133265607696. Its totient is φ = 36964624800.

The previous prime is 81381134047. The next prime is 81381134101. The reversal of 81381134054 is 45043118318.

It is a junction number, because it is equal to n+sod(n) for n = 81381133999 and 81381134017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1308917 + ... + 1369680.

It is an arithmetic number, because the mean of its divisors is an integer number (8329100481).

Almost surely, 2^81381134054 is an apocalyptic number.

81381134054 is a deficient number, since it is larger than the sum of its proper divisors (51884473642).

81381134054 is a wasteful number, since it uses less digits than its factorization.

81381134054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679991.

The product of its (nonzero) digits is 46080, while the sum is 38.

The spelling of 81381134054 in words is "eighty-one billion, three hundred eighty-one million, one hundred thirty-four thousand, fifty-four".