81018134 has 16 divisors (see below), whose sum is σ = 123789120. Its totient is φ = 39761280.

The previous prime is 81018131. The next prime is 81018163. The reversal of 81018134 is 43181018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81018131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27182 + ... + 30014.

It is an arithmetic number, because the mean of its divisors is an integer number (7736820).

Almost surely, 2^81018134 is an apocalyptic number.

81018134 is a deficient number, since it is larger than the sum of its proper divisors (42770986).

81018134 is a wasteful number, since it uses less digits than its factorization.

81018134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3095.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 81018134 is about 9001.0073880650. The cubic root of 81018134 is about 432.7071572678.

The spelling of 81018134 in words is "eighty-one million, eighteen thousand, one hundred thirty-four".