81796019 has 8 divisors (see below), whose sum is σ = 84173760. Its totient is φ = 79439976.

The previous prime is 81795997. The next prime is 81796031. The reversal of 81796019 is 91069718.

It is a happy number.

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 81796019 - 2¹² = 81791923 is a prime.

It is a super-2 number, since 2×81796019² = 13381177448496722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81796219) 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 7 ways as a sum of consecutive naturals, for example, 2384 + ... + 13010.

It is an arithmetic number, because the mean of its divisors is an integer number (10521720).

Almost surely, 2^81796019 is an apocalyptic number.

81796019 is a deficient number, since it is larger than the sum of its proper divisors (2377741).

81796019 is a wasteful number, since it uses less digits than its factorization.

81796019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10849.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 81796019 is about 9044.1151584884. The cubic root of 81796019 is about 434.0876089357.

The spelling of 81796019 in words is "eighty-one million, seven hundred ninety-six thousand, nineteen".