81994683 has 8 divisors (see below), whose sum is σ = 109408768. Its totient is φ = 54621864.

The previous prime is 81994681. The next prime is 81994691. The reversal of 81994683 is 38649918.

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

It is not a de Polignac number, because 81994683 - 2¹ = 81994681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81994681) 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, 5335 + ... + 13872.

It is an arithmetic number, because the mean of its divisors is an integer number (13676096).

Almost surely, 2^81994683 is an apocalyptic number.

81994683 is a deficient number, since it is larger than the sum of its proper divisors (27414085).

81994683 is a wasteful number, since it uses less digits than its factorization.

81994683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20633.

The product of its digits is 373248, while the sum is 48.

The square root of 81994683 is about 9055.0915511661. The cubic root of 81994683 is about 434.4387582893.

The spelling of 81994683 in words is "eighty-one million, nine hundred ninety-four thousand, six hundred eighty-three".