81852873 has 4 divisors (see below), whose sum is σ = 109137168. Its totient is φ = 54568580.

The previous prime is 81852871. The next prime is 81852889. The reversal of 81852873 is 37825818.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81852873 - 2¹ = 81852871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81852871) 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, 13642143 + ... + 13642148.

It is an arithmetic number, because the mean of its divisors is an integer number (27284292).

Almost surely, 2^81852873 is an apocalyptic number.

It is an amenable number.

81852873 is a deficient number, since it is larger than the sum of its proper divisors (27284295).

81852873 is a wasteful number, since it uses less digits than its factorization.

81852873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27284294.

The product of its digits is 107520, while the sum is 42.

The square root of 81852873 is about 9047.2577613330. The cubic root of 81852873 is about 434.1881594735.

The spelling of 81852873 in words is "eighty-one million, eight hundred fifty-two thousand, eight hundred seventy-three".