81799313 has 8 divisors (see below), whose sum is σ = 87318720. Its totient is φ = 76401360.

The previous prime is 81799307. The next prime is 81799327. The reversal of 81799313 is 31399718.

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 81799313 - 2²² = 77605009 is a prime.

It is a super-2 number, since 2×81799313² = 13382255214543938, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81799363) 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, 28970 + ... + 31667.

It is an arithmetic number, because the mean of its divisors is an integer number (10914840).

Almost surely, 2^81799313 is an apocalyptic number.

It is an amenable number.

81799313 is a deficient number, since it is larger than the sum of its proper divisors (5519407).

81799313 is a wasteful number, since it uses less digits than its factorization.

81799313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60727.

The product of its digits is 40824, while the sum is 41.

The square root of 81799313 is about 9044.2972640222. The cubic root of 81799313 is about 434.0934358916.

The spelling of 81799313 in words is "eighty-one million, seven hundred ninety-nine thousand, three hundred thirteen".