81298713 has 8 divisors (see below), whose sum is σ = 109883488. Its totient is φ = 53456544.

The previous prime is 81298703. The next prime is 81298717. The reversal of 81298713 is 31789218.

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

It is not a de Polignac number, because 81298713 - 2⁸ = 81298457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81298717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185395 + ... + 185832.

It is an arithmetic number, because the mean of its divisors is an integer number (13735436).

Almost surely, 2^81298713 is an apocalyptic number.

It is an amenable number.

81298713 is a deficient number, since it is larger than the sum of its proper divisors (28584775).

81298713 is a wasteful number, since it uses less digits than its factorization.

81298713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371303.

The product of its digits is 24192, while the sum is 39.

The square root of 81298713 is about 9016.5798948382. The cubic root of 81298713 is about 433.2060935429.

The spelling of 81298713 in words is "eighty-one million, two hundred ninety-eight thousand, seven hundred thirteen".