81100434 has 16 divisors (see below), whose sum is σ = 162537120. Its totient is φ = 26977440.

The previous prime is 81100399. The next prime is 81100447. The reversal of 81100434 is 43400118.

It is a self number, because there is not a number n which added to its sum of digits gives 81100434.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10819 + ... + 16710.

It is an arithmetic number, because the mean of its divisors is an integer number (10158570).

Almost surely, 2^81100434 is an apocalyptic number.

81100434 is an abundant number, since it is smaller than the sum of its proper divisors (81436686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81100434 is a wasteful number, since it uses less digits than its factorization.

81100434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28025.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 81100434 is about 9005.5779381448. The cubic root of 81100434 is about 432.8536254952.

The spelling of 81100434 in words is "eighty-one million, one hundred thousand, four hundred thirty-four".