520642511 has 2 divisors, whose sum is σ = 520642512. Its totient is φ = 520642510.

The previous prime is 520642501. The next prime is 520642531. The reversal of 520642511 is 115246025.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520642511 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 (520642501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260321255 + 260321256.

It is an arithmetic number, because the mean of its divisors is an integer number (260321256).

Almost surely, 2^520642511 is an apocalyptic number.

520642511 is a deficient number, since it is larger than the sum of its proper divisors (1).

520642511 is an equidigital number, since it uses as much as digits as its factorization.

520642511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 520642511 is about 22817.5921385233. The cubic root of 520642511 is about 804.4762154690.

Adding to 520642511 its reverse (115246025), we get a palindrome (635888536).

The spelling of 520642511 in words is "five hundred twenty million, six hundred forty-two thousand, five hundred eleven".