521342506 has 16 divisors (see below), whose sum is σ = 805197960. Its totient is φ = 252979200.

The previous prime is 521342489. The next prime is 521342551. The reversal of 521342506 is 605243125.

It can be written as a sum of positive squares in 4 ways, for example, as 510353281 + 10989225 = 22591^2 + 3315^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20890 + ... + 38458.

Almost surely, 2^521342506 is an apocalyptic number.

521342506 is a deficient number, since it is larger than the sum of its proper divisors (283855454).

521342506 is a wasteful number, since it uses less digits than its factorization.

521342506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18009.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 521342506 is about 22832.9259185064. The cubic root of 521342506 is about 804.8365888745.

The spelling of 521342506 in words is "five hundred twenty-one million, three hundred forty-two thousand, five hundred six".