81298323 has 12 divisors (see below), whose sum is σ = 121780568. Its totient is φ = 54198720.

The previous prime is 81298313. The next prime is 81298351. The reversal of 81298323 is 32389218.

It is a happy number.

It is not a de Polignac number, because 81298323 - 2⁵ = 81298291 is a prime.

It is a super-2 number, since 2×81298323² = 13218834645224658, which contains 22 as substring.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81298313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167038 + ... + 167523.

Almost surely, 2^81298323 is an apocalyptic number.

81298323 is a deficient number, since it is larger than the sum of its proper divisors (40482245).

81298323 is an equidigital number, since it uses as much as digits as its factorization.

81298323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334576 (or 334564 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 81298323 is about 9016.5582679867. The cubic root of 81298323 is about 433.2054008274.

The spelling of 81298323 in words is "eighty-one million, two hundred ninety-eight thousand, three hundred twenty-three".