81834357 has 24 divisors (see below), whose sum is σ = 121998240. Its totient is φ = 48743200.

The previous prime is 81834329. The next prime is 81834359. The reversal of 81834357 is 75343818.

It is not a de Polignac number, because 81834357 - 2²⁴ = 65057141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81834359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19507 + ... + 23327.

It is an arithmetic number, because the mean of its divisors is an integer number (5083260).

Almost surely, 2^81834357 is an apocalyptic number.

It is an amenable number.

81834357 is a deficient number, since it is larger than the sum of its proper divisors (40163883).

81834357 is a wasteful number, since it uses less digits than its factorization.

81834357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3905 (or 3894 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 81834357 is about 9046.2344099631. The cubic root of 81834357 is about 434.1554176610.

It can be divided in two parts, 81 and 834357, that added together give a palindrome (834438).

The spelling of 81834357 in words is "eighty-one million, eight hundred thirty-four thousand, three hundred fifty-seven".