81171158135 has 16 divisors (see below), whose sum is σ = 97980304800. Its totient is φ = 64554779520.

The previous prime is 81171158087. The next prime is 81171158143. The reversal of 81171158135 is 53185117118.

It is not a de Polignac number, because 81171158135 - 2³⁴ = 63991288951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81171158092 and 81171158101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 507329 + ... + 647861.

It is an arithmetic number, because the mean of its divisors is an integer number (6123769050).

Almost surely, 2^81171158135 is an apocalyptic number.

81171158135 is a deficient number, since it is larger than the sum of its proper divisors (16809146665).

81171158135 is a wasteful number, since it uses less digits than its factorization.

81171158135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141218.

The product of its digits is 33600, while the sum is 41.

The spelling of 81171158135 in words is "eighty-one billion, one hundred seventy-one million, one hundred fifty-eight thousand, one hundred thirty-five".