81013434 has 16 divisors (see below), whose sum is σ = 162406272. Its totient is φ = 26941248.

The previous prime is 81013423. The next prime is 81013441. The reversal of 81013434 is 43431018.

It is a Curzon number.

It is an unprimeable number.

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, 12994 + ... + 18189.

It is an arithmetic number, because the mean of its divisors is an integer number (10150392).

Almost surely, 2^81013434 is an apocalyptic number.

81013434 is an abundant number, since it is smaller than the sum of its proper divisors (81392838).

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

81013434 is a wasteful number, since it uses less digits than its factorization.

81013434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31621.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 81013434 is about 9000.7463023907. The cubic root of 81013434 is about 432.6987897462.

The spelling of 81013434 in words is "eighty-one million, thirteen thousand, four hundred thirty-four".