81829193 has 8 divisors (see below), whose sum is σ = 85641408. Its totient is φ = 78038224.

The previous prime is 81829159. The next prime is 81829207. The reversal of 81829193 is 39192818.

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

It is a cyclic number.

It is not a de Polignac number, because 81829193 - 2¹⁸ = 81567049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81829193.

It is not an unprimeable number, because it can be changed into a prime (81829393) 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, 2855 + ... + 13107.

It is an arithmetic number, because the mean of its divisors is an integer number (10705176).

Almost surely, 2^81829193 is an apocalyptic number.

It is an amenable number.

81829193 is a deficient number, since it is larger than the sum of its proper divisors (3812215).

81829193 is a wasteful number, since it uses less digits than its factorization.

81829193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10623.

The product of its digits is 31104, while the sum is 41.

The square root of 81829193 is about 9045.9489828320. The cubic root of 81829193 is about 434.1462852876.

The spelling of 81829193 in words is "eighty-one million, eight hundred twenty-nine thousand, one hundred ninety-three".