520689245 has 4 divisors (see below), whose sum is σ = 624827100. Its totient is φ = 416551392.

The previous prime is 520689233. The next prime is 520689263. The reversal of 520689245 is 542986025.

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 77123524 + 443565721 = 8782^2 + 21061^2 .

It is a cyclic number.

It is not a de Polignac number, because 520689245 - 2⁶ = 520689181 is a prime.

It is a super-2 number, since 2×520689245² = 542234579717340050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52068920 + ... + 52068929.

It is an arithmetic number, because the mean of its divisors is an integer number (156206775).

Almost surely, 2^520689245 is an apocalyptic number.

It is an amenable number.

520689245 is a deficient number, since it is larger than the sum of its proper divisors (104137855).

520689245 is a wasteful number, since it uses less digits than its factorization.

520689245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104137854.

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 520689245 is about 22818.6161938011. The cubic root of 520689245 is about 804.5002852583.

The spelling of 520689245 in words is "five hundred twenty million, six hundred eighty-nine thousand, two hundred forty-five".