81941934 has 8 divisors (see below), whose sum is σ = 163883880. Its totient is φ = 27313976.

The previous prime is 81941933. The next prime is 81941957. The reversal of 81941934 is 43914918.

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

81941934 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 81941892 and 81941901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81941933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6828489 + ... + 6828500.

It is an arithmetic number, because the mean of its divisors is an integer number (20485485).

Almost surely, 2^81941934 is an apocalyptic number.

81941934 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81941934 is a wasteful number, since it uses less digits than its factorization.

81941934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13656994.

The product of its digits is 31104, while the sum is 39.

The square root of 81941934 is about 9052.1784118520. The cubic root of 81941934 is about 434.3455769384.

The spelling of 81941934 in words is "eighty-one million, nine hundred forty-one thousand, nine hundred thirty-four".