81298369 has 8 divisors (see below), whose sum is σ = 86611680. Its totient is φ = 76044096.

The previous prime is 81298363. The next prime is 81298379. The reversal of 81298369 is 96389218.

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 81298369 - 2⁷ = 81298241 is a prime.

It is a super-2 number, since 2×81298369² = 13218849604120322, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (81298363) 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, 11899 + ... + 17440.

It is an arithmetic number, because the mean of its divisors is an integer number (10826460).

Almost surely, 2^81298369 is an apocalyptic number.

It is an amenable number.

81298369 is a deficient number, since it is larger than the sum of its proper divisors (5313311).

81298369 is a wasteful number, since it uses less digits than its factorization.

81298369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29519.

The product of its digits is 186624, while the sum is 46.

The square root of 81298369 is about 9016.5608188488. The cubic root of 81298369 is about 433.2054825324.

The spelling of 81298369 in words is "eighty-one million, two hundred ninety-eight thousand, three hundred sixty-nine".