81300317 has 8 divisors (see below), whose sum is σ = 93035712. Its totient is φ = 69595200.

The previous prime is 81300301. The next prime is 81300337. The reversal of 81300317 is 71300318.

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 81300317 - 2⁴ = 81300301 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81300292 and 81300301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81300337) 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, 1484 + ... + 12837.

It is an arithmetic number, because the mean of its divisors is an integer number (11629464).

Almost surely, 2^81300317 is an apocalyptic number.

It is an amenable number.

81300317 is a deficient number, since it is larger than the sum of its proper divisors (11735395).

81300317 is a wasteful number, since it uses less digits than its factorization.

81300317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15139.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 81300317 is about 9016.6688416510. The cubic root of 81300317 is about 433.2089425343.

Subtracting from 81300317 its reverse (71300318), we obtain a palindrome (9999999).

The spelling of 81300317 in words is "eighty-one million, three hundred thousand, three hundred seventeen".