81997483 has 8 divisors (see below), whose sum is σ = 86442320. Its totient is φ = 77565600.

The previous prime is 81997463. The next prime is 81997523. The reversal of 81997483 is 38479918.

It is a happy number.

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

It is not a de Polignac number, because 81997483 - 2⁵ = 81997451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81997453) 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, 11533 + ... + 17233.

It is an arithmetic number, because the mean of its divisors is an integer number (10805290).

Almost surely, 2^81997483 is an apocalyptic number.

81997483 is a deficient number, since it is larger than the sum of its proper divisors (4444837).

81997483 is a wasteful number, since it uses less digits than its factorization.

81997483 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6477.

The product of its digits is 435456, while the sum is 49.

The square root of 81997483 is about 9055.2461589953. The cubic root of 81997483 is about 434.4437033851.

The spelling of 81997483 in words is "eighty-one million, nine hundred ninety-seven thousand, four hundred eighty-three".