81935893 has 8 divisors (see below), whose sum is σ = 88343136. Its totient is φ = 75543600.

The previous prime is 81935879. The next prime is 81935921. The reversal of 81935893 is 39853918.

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

It is a cyclic number.

It is not a de Polignac number, because 81935893 - 2¹³ = 81927701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81935813) 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, 9378 + ... + 15868.

It is an arithmetic number, because the mean of its divisors is an integer number (11042892).

Almost surely, 2^81935893 is an apocalyptic number.

It is an amenable number.

81935893 is a deficient number, since it is larger than the sum of its proper divisors (6407243).

81935893 is a wasteful number, since it uses less digits than its factorization.

81935893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7475.

The product of its digits is 233280, while the sum is 46.

The square root of 81935893 is about 9051.8447291146. The cubic root of 81935893 is about 434.3349029323.

It can be divided in two parts, 81935 and 893, that added together give a palindrome (82828).

The spelling of 81935893 in words is "eighty-one million, nine hundred thirty-five thousand, eight hundred ninety-three".