521608343 has 4 divisors (see below), whose sum is σ = 521853888. Its totient is φ = 521362800.

The previous prime is 521608319. The next prime is 521608363. The reversal of 521608343 is 343806125.

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 521608343 - 2⁶ = 521608279 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 (521608363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119558 + ... + 123843.

It is an arithmetic number, because the mean of its divisors is an integer number (130463472).

Almost surely, 2^521608343 is an apocalyptic number.

521608343 is a deficient number, since it is larger than the sum of its proper divisors (245545).

521608343 is a wasteful number, since it uses less digits than its factorization.

521608343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245544.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 521608343 is about 22838.7465286517. The cubic root of 521608343 is about 804.9733633150.

The spelling of 521608343 in words is "five hundred twenty-one million, six hundred eight thousand, three hundred forty-three".