521340534 has 96 divisors (see below), whose sum is σ = 1347300864. Its totient is φ = 143605440.

The previous prime is 521340527. The next prime is 521340541. The reversal of 521340534 is 435043125.

It is an interprime number because it is at equal distance from previous prime (521340527) and next prime (521340541).

It is a junction number, because it is equal to n+sod(n) for n = 521340498 and 521340507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 170947 + ... + 173969.

It is an arithmetic number, because the mean of its divisors is an integer number (14034384).

Almost surely, 2^521340534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521340534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (673650432).

521340534 is an abundant number, since it is smaller than the sum of its proper divisors (825960330).

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

521340534 is a wasteful number, since it uses less digits than its factorization.

521340534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3122 (or 3119 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 521340534 is about 22832.8827352133. The cubic root of 521340534 is about 804.8355740971.

Adding to 521340534 its reverse (435043125), we get a palindrome (956383659).

The spelling of 521340534 in words is "five hundred twenty-one million, three hundred forty thousand, five hundred thirty-four".