81234555 has 16 divisors (see below), whose sum is σ = 131239680. Its totient is φ = 42903648.

The previous prime is 81234553. The next prime is 81234581. The reversal of 81234555 is 55543218.

It is not a de Polignac number, because 81234555 - 2¹ = 81234553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81234553) 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, 24745 + ... + 27834.

It is an arithmetic number, because the mean of its divisors is an integer number (8202480).

Almost surely, 2^81234555 is an apocalyptic number.

81234555 is a deficient number, since it is larger than the sum of its proper divisors (50005125).

81234555 is a wasteful number, since it uses less digits than its factorization.

81234555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52690.

The product of its digits is 24000, while the sum is 33.

The square root of 81234555 is about 9013.0214134884. The cubic root of 81234555 is about 433.0921066995.

The spelling of 81234555 in words is "eighty-one million, two hundred thirty-four thousand, five hundred fifty-five".