520564991 has 2 divisors, whose sum is σ = 520564992. Its totient is φ = 520564990.

The previous prime is 520564981. The next prime is 520565029. The reversal of 520564991 is 199465025.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 520564991 - 2¹⁴ = 520548607 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520564901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260282495 + 260282496.

It is an arithmetic number, because the mean of its divisors is an integer number (260282496).

Almost surely, 2^520564991 is an apocalyptic number.

520564991 is a deficient number, since it is larger than the sum of its proper divisors (1).

520564991 is an equidigital number, since it uses as much as digits as its factorization.

520564991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 520564991 is about 22815.8933859711. The cubic root of 520564991 is about 804.4362865412.

The spelling of 520564991 in words is "five hundred twenty million, five hundred sixty-four thousand, nine hundred ninety-one".