521713481 has 4 divisors (see below), whose sum is σ = 522349764. Its totient is φ = 521077200.

The previous prime is 521713471. The next prime is 521713499. The reversal of 521713481 is 184317125.

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

It can be written as a sum of positive squares in 2 ways, for example, as 265201225 + 256512256 = 16285^2 + 16016^2 .

It is a cyclic number.

It is not a de Polignac number, because 521713481 - 2⁶ = 521713417 is a prime.

It is a super-2 number, since 2×521713481² = 544369912514274722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521713411) 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, 316910 + ... + 318551.

It is an arithmetic number, because the mean of its divisors is an integer number (130587441).

Almost surely, 2^521713481 is an apocalyptic number.

It is an amenable number.

521713481 is a deficient number, since it is larger than the sum of its proper divisors (636283).

521713481 is an equidigital number, since it uses as much as digits as its factorization.

521713481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636282.

The product of its digits is 6720, while the sum is 32.

The square root of 521713481 is about 22841.0481589615. The cubic root of 521713481 is about 805.0274445075.

The spelling of 521713481 in words is "five hundred twenty-one million, seven hundred thirteen thousand, four hundred eighty-one".