81298893 has 16 divisors (see below), whose sum is σ = 117259520. Its totient is φ = 49806144.

The previous prime is 81298883. The next prime is 81298897. The reversal of 81298893 is 39889218.

It is a happy number.

It is not a de Polignac number, because 81298893 - 2⁶ = 81298829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81298897) 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 15 ways as a sum of consecutive naturals, for example, 4380 + ... + 13482.

It is an arithmetic number, because the mean of its divisors is an integer number (7328720).

Almost surely, 2^81298893 is an apocalyptic number.

It is an amenable number.

81298893 is a deficient number, since it is larger than the sum of its proper divisors (35960627).

81298893 is a wasteful number, since it uses less digits than its factorization.

81298893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9348.

The product of its digits is 248832, while the sum is 48.

The square root of 81298893 is about 9016.5898764444. The cubic root of 81298893 is about 433.2064132570.

The spelling of 81298893 in words is "eighty-one million, two hundred ninety-eight thousand, eight hundred ninety-three".