520511749 has 8 divisors (see below), whose sum is σ = 538823160. Its totient is φ = 502224576.

The previous prime is 520511743. The next prime is 520511759. The reversal of 520511749 is 947115025.

It can be written as a sum of positive squares in 4 ways, for example, as 70308225 + 450203524 = 8385^2 + 21218^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 520511749 - 2³ = 520511741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520511741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45079 + ... + 55435.

It is an arithmetic number, because the mean of its divisors is an integer number (67352895).

Almost surely, 2^520511749 is an apocalyptic number.

It is an amenable number.

520511749 is a deficient number, since it is larger than the sum of its proper divisors (18311411).

520511749 is a wasteful number, since it uses less digits than its factorization.

520511749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12119.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 520511749 is about 22814.7265817498. The cubic root of 520511749 is about 804.4088604063.

The spelling of 520511749 in words is "five hundred twenty million, five hundred eleven thousand, seven hundred forty-nine".