82543813 has 4 divisors (see below), whose sum is σ = 90047808. Its totient is φ = 75039820.

The previous prime is 82543763. The next prime is 82543829. The reversal of 82543813 is 31834528.

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 82543813 - 2²¹ = 80446661 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 (82543883) 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 3 ways as a sum of consecutive naturals, for example, 3751981 + ... + 3752002.

It is an arithmetic number, because the mean of its divisors is an integer number (22511952).

Almost surely, 2^82543813 is an apocalyptic number.

It is an amenable number.

82543813 is a deficient number, since it is larger than the sum of its proper divisors (7503995).

82543813 is a wasteful number, since it uses less digits than its factorization.

82543813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7503994.

The product of its digits is 23040, while the sum is 34.

The square root of 82543813 is about 9085.3625684394. The cubic root of 82543813 is about 435.4064338959.

The spelling of 82543813 in words is "eighty-two million, five hundred forty-three thousand, eight hundred thirteen".