521752106 has 4 divisors (see below), whose sum is σ = 782628162. Its totient is φ = 260876052.

The previous prime is 521752073. The next prime is 521752109. The reversal of 521752106 is 601257125.

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

It can be written as a sum of positive squares in only one way, i.e., 490223881 + 31528225 = 22141^2 + 5615^2 .

It is not an unprimeable number, because it can be changed into a prime (521752109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130438025 + ... + 130438028.

Almost surely, 2^521752106 is an apocalyptic number.

521752106 is a deficient number, since it is larger than the sum of its proper divisors (260876056).

521752106 is a wasteful number, since it uses less digits than its factorization.

521752106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260876055.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 521752106 is about 22841.8936605528. The cubic root of 521752106 is about 805.0473107233.

The spelling of 521752106 in words is "five hundred twenty-one million, seven hundred fifty-two thousand, one hundred six".