520533749 has 2 divisors, whose sum is σ = 520533750. Its totient is φ = 520533748.

The previous prime is 520533743. The next prime is 520533763. The reversal of 520533749 is 947335025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 431891524 + 88642225 = 20782^2 + 9415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520533749 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520533743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260266874 + 260266875.

It is an arithmetic number, because the mean of its divisors is an integer number (260266875).

Almost surely, 2^520533749 is an apocalyptic number.

It is an amenable number.

520533749 is a deficient number, since it is larger than the sum of its proper divisors (1).

520533749 is an equidigital number, since it uses as much as digits as its factorization.

520533749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 38.

The square root of 520533749 is about 22815.2087213771. The cubic root of 520533749 is about 804.4201933209.

The spelling of 520533749 in words is "five hundred twenty million, five hundred thirty-three thousand, seven hundred forty-nine".