81300319 has 4 divisors (see below), whose sum is σ = 82414096. Its totient is φ = 80186544.

The previous prime is 81300301. The next prime is 81300337. The reversal of 81300319 is 91300318.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (81300301) and next prime (81300337).

It is a cyclic number.

It is not a de Polignac number, because 81300319 - 2⁵ = 81300287 is a prime.

It is a super-2 number, since 2×81300319² = 13219483739003522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81300293 and 81300302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81300379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 556779 + ... + 556924.

It is an arithmetic number, because the mean of its divisors is an integer number (20603524).

Almost surely, 2^81300319 is an apocalyptic number.

81300319 is a deficient number, since it is larger than the sum of its proper divisors (1113777).

81300319 is a wasteful number, since it uses less digits than its factorization.

81300319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113776.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 81300319 is about 9016.6689525567. The cubic root of 81300319 is about 433.2089460867.

Subtracting 81300319 from its reverse (91300318), we obtain a palindrome (9999999).

The spelling of 81300319 in words is "eighty-one million, three hundred thousand, three hundred nineteen".