520531997 has 2 divisors, whose sum is σ = 520531998. Its totient is φ = 520531996.

The previous prime is 520531981. The next prime is 520532009. The reversal of 520531997 is 799135025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 310252996 + 210279001 = 17614^2 + 14501^2 .

It is a cyclic number.

It is not a de Polignac number, because 520531997 - 2⁴ = 520531981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520531937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260265998 + 260265999.

It is an arithmetic number, because the mean of its divisors is an integer number (260265999).

Almost surely, 2^520531997 is an apocalyptic number.

It is an amenable number.

520531997 is a deficient number, since it is larger than the sum of its proper divisors (1).

520531997 is an equidigital number, since it uses as much as digits as its factorization.

520531997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 85050, while the sum is 41.

The square root of 520531997 is about 22815.1703259038. The cubic root of 520531997 is about 804.4192908205.

The spelling of 520531997 in words is "five hundred twenty million, five hundred thirty-one thousand, nine hundred ninety-seven".