521335047 has 4 divisors (see below), whose sum is σ = 695113400. Its totient is φ = 347556696.

The previous prime is 521335027. The next prime is 521335051. The reversal of 521335047 is 740533125.

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

It is not a de Polignac number, because 521335047 - 2¹⁴ = 521318663 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 (521335007) 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, 86889172 + ... + 86889177.

It is an arithmetic number, because the mean of its divisors is an integer number (173778350).

Almost surely, 2^521335047 is an apocalyptic number.

521335047 is a deficient number, since it is larger than the sum of its proper divisors (173778353).

521335047 is a wasteful number, since it uses less digits than its factorization.

521335047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173778352.

The product of its (nonzero) digits is 12600, while the sum is 30.

The square root of 521335047 is about 22832.7625792413. The cubic root of 521335047 is about 804.8327505119.

The spelling of 521335047 in words is "five hundred twenty-one million, three hundred thirty-five thousand, forty-seven".