81134799571 has 16 divisors (see below), whose sum is σ = 97849244160. Its totient is φ = 65719555200.

The previous prime is 81134799521. The next prime is 81134799593. The reversal of 81134799571 is 17599743118.

It is a cyclic number.

It is not a de Polignac number, because 81134799571 - 2¹⁵ = 81134766803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81134799521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 707311 + ... + 813976.

It is an arithmetic number, because the mean of its divisors is an integer number (6115577760).

Almost surely, 2^81134799571 is an apocalyptic number.

81134799571 is a deficient number, since it is larger than the sum of its proper divisors (16714444589).

81134799571 is a wasteful number, since it uses less digits than its factorization.

81134799571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521714.

The product of its digits is 1905120, while the sum is 55.

The spelling of 81134799571 in words is "eighty-one billion, one hundred thirty-four million, seven hundred ninety-nine thousand, five hundred seventy-one".