81935943 has 8 divisors (see below), whose sum is σ = 109294848. Its totient is φ = 54600504.

The previous prime is 81935939. The next prime is 81935957. The reversal of 81935943 is 34953918.

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

It is not a de Polignac number, because 81935943 - 2² = 81935939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81935895 and 81935904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81935963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5346 + ... + 13872.

It is an arithmetic number, because the mean of its divisors is an integer number (13661856).

Almost surely, 2^81935943 is an apocalyptic number.

81935943 is a deficient number, since it is larger than the sum of its proper divisors (27358905).

81935943 is a wasteful number, since it uses less digits than its factorization.

81935943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11733.

The product of its digits is 116640, while the sum is 42.

The square root of 81935943 is about 9051.8474909822. The cubic root of 81935943 is about 434.3349912808.

The spelling of 81935943 in words is "eighty-one million, nine hundred thirty-five thousand, nine hundred forty-three".