81823883 has 4 divisors (see below), whose sum is σ = 83726808. Its totient is φ = 79920960.

The previous prime is 81823871. The next prime is 81823913. The reversal of 81823883 is 38832818.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81823883 - 2⁴ = 81823867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81823883.

It is not an unprimeable number, because it can be changed into a prime (81823813) 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, 951398 + ... + 951483.

It is an arithmetic number, because the mean of its divisors is an integer number (20931702).

Almost surely, 2^81823883 is an apocalyptic number.

81823883 is a deficient number, since it is larger than the sum of its proper divisors (1902925).

81823883 is a wasteful number, since it uses less digits than its factorization.

81823883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902924.

The product of its digits is 73728, while the sum is 41.

The square root of 81823883 is about 9045.6554765257. The cubic root of 81823883 is about 434.1368943169.

The spelling of 81823883 in words is "eighty-one million, eight hundred twenty-three thousand, eight hundred eighty-three".