521711380 has 12 divisors (see below), whose sum is σ = 1095593940. Its totient is φ = 208684544.

The previous prime is 521711321. The next prime is 521711381. The reversal of 521711380 is 83117125.

It can be written as a sum of positive squares in 2 ways, for example, as 198359056 + 323352324 = 14084^2 + 17982^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521711381) 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, 13042765 + ... + 13042804.

It is an arithmetic number, because the mean of its divisors is an integer number (91299495).

Almost surely, 2^521711380 is an apocalyptic number.

It is an amenable number.

521711380 is an abundant number, since it is smaller than the sum of its proper divisors (573882560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521711380 is a wasteful number, since it uses less digits than its factorization.

521711380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26085578 (or 26085576 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 521711380 is about 22841.0021671555. The cubic root of 521711380 is about 805.0263638602.

The spelling of 521711380 in words is "five hundred twenty-one million, seven hundred eleven thousand, three hundred eighty".