81933198 has 8 divisors (see below), whose sum is σ = 163866408. Its totient is φ = 27311064.

The previous prime is 81933197. The next prime is 81933233. The reversal of 81933198 is 89133918.

It is a happy number.

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

81933198 is an admirable number.

It is a super-3 number, since 3×81933198³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81933197) 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 3 ways as a sum of consecutive naturals, for example, 6827761 + ... + 6827772.

It is an arithmetic number, because the mean of its divisors is an integer number (20483301).

Almost surely, 2^81933198 is an apocalyptic number.

81933198 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.

81933198 is a wasteful number, since it uses less digits than its factorization.

81933198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13655538.

The product of its digits is 46656, while the sum is 42.

The square root of 81933198 is about 9051.6958632071. The cubic root of 81933198 is about 434.3301408948.

The spelling of 81933198 in words is "eighty-one million, nine hundred thirty-three thousand, one hundred ninety-eight".