521347 has 4 divisors (see below), whose sum is σ = 526240. Its totient is φ = 516456.

The previous prime is 521329. The next prime is 521357. The reversal of 521347 is 743125.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2283 + ... + 2500.

It is an arithmetic number, because the mean of its divisors is an integer number (131560).

2⁵²¹³⁴⁷ is an apocalyptic number.

521347 is a deficient number, since it is larger than the sum of its proper divisors (4893).

521347 is a wasteful number, since it uses less digits than its factorization.

521347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4892.

The product of its digits is 840, while the sum is 22.

The square root of 521347 is about 722.0436274907. The cubic root of 521347 is about 80.4838901446.

It can be divided in two parts, 521 and 347, that added together give a palindrome (868).

The spelling of 521347 in words is "five hundred twenty-one thousand, three hundred forty-seven".