81355594 has 8 divisors (see below), whose sum is σ = 125970048. Its totient is φ = 39365580.

The previous prime is 81355541. The next prime is 81355607. The reversal of 81355594 is 49555318.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 656032 + ... + 656155.

It is an arithmetic number, because the mean of its divisors is an integer number (15746256).

Almost surely, 2^81355594 is an apocalyptic number.

81355594 is a deficient number, since it is larger than the sum of its proper divisors (44614454).

81355594 is a wasteful number, since it uses less digits than its factorization.

81355594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312220.

The product of its digits is 108000, while the sum is 40.

The square root of 81355594 is about 9019.7335880834. The cubic root of 81355594 is about 433.3071015022.

The spelling of 81355594 in words is "eighty-one million, three hundred fifty-five thousand, five hundred ninety-four".