81814823 has 8 divisors (see below), whose sum is σ = 83379648. Its totient is φ = 80262144.

The previous prime is 81814801. The next prime is 81814867. The reversal of 81814823 is 32841818.

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 81814823 - 2²⁴ = 65037607 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 (81814123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11186 + ... + 16992.

It is an arithmetic number, because the mean of its divisors is an integer number (10422456).

Almost surely, 2^81814823 is an apocalyptic number.

81814823 is a deficient number, since it is larger than the sum of its proper divisors (1564825).

81814823 is a wasteful number, since it uses less digits than its factorization.

81814823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6073.

The product of its digits is 12288, while the sum is 35.

The square root of 81814823 is about 9045.1546697666. The cubic root of 81814823 is about 434.1208703669.

The spelling of 81814823 in words is "eighty-one million, eight hundred fourteen thousand, eight hundred twenty-three".