81368323 has 4 divisors (see below), whose sum is σ = 81456840. Its totient is φ = 81279808.

The previous prime is 81368321. The next prime is 81368347. The reversal of 81368323 is 32386318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32386318 = 2 ⋅16193159.

It is a cyclic number.

It is not a de Polignac number, because 81368323 - 2¹ = 81368321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81368321) 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, 42865 + ... + 44722.

It is an arithmetic number, because the mean of its divisors is an integer number (20364210).

Almost surely, 2^81368323 is an apocalyptic number.

81368323 is a deficient number, since it is larger than the sum of its proper divisors (88517).

81368323 is an equidigital number, since it uses as much as digits as its factorization.

81368323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88516.

The product of its digits is 20736, while the sum is 34.

The square root of 81368323 is about 9020.4391799956. The cubic root of 81368323 is about 433.3296989176.

The spelling of 81368323 in words is "eighty-one million, three hundred sixty-eight thousand, three hundred twenty-three".