81012134 has 16 divisors (see below), whose sum is σ = 138996000. Its totient is φ = 34689984.

The previous prime is 81012121. The next prime is 81012137. The reversal of 81012134 is 43121018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81012137) 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, 25802 + ... + 28770.

It is an arithmetic number, because the mean of its divisors is an integer number (8687250).

Almost surely, 2^81012134 is an apocalyptic number.

81012134 is a deficient number, since it is larger than the sum of its proper divisors (57983866).

81012134 is a wasteful number, since it uses less digits than its factorization.

81012134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4927.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 81012134 is about 9000.6740858671. The cubic root of 81012134 is about 432.6964752681.

The spelling of 81012134 in words is "eighty-one million, twelve thousand, one hundred thirty-four".