81848359 has 4 divisors (see below), whose sum is σ = 82215616. Its totient is φ = 81481104.

The previous prime is 81848357. The next prime is 81848369. The reversal of 81848359 is 95384818.

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 81848359 - 2¹ = 81848357 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 (81848357) 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, 183294 + ... + 183739.

It is an arithmetic number, because the mean of its divisors is an integer number (20553904).

Almost surely, 2^81848359 is an apocalyptic number.

81848359 is a deficient number, since it is larger than the sum of its proper divisors (367257).

81848359 is a wasteful number, since it uses less digits than its factorization.

81848359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367256.

The product of its digits is 276480, while the sum is 46.

The square root of 81848359 is about 9047.0082900371. The cubic root of 81848359 is about 434.1801778298.

The spelling of 81848359 in words is "eighty-one million, eight hundred forty-eight thousand, three hundred fifty-nine".