520691 has 2 divisors, whose sum is σ = 520692. Its totient is φ = 520690.

The previous prime is 520679. The next prime is 520699. The reversal of 520691 is 196025.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 520691 - 2¹⁰ = 519667 is a prime.

It is a super-2 number, since 2×520691² = 542238234962, which contains 22 as substring.

It is a zygodrome in base 2.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 520691.

It is not a weakly prime, because it can be changed into another prime (520699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260345 + 260346.

It is an arithmetic number, because the mean of its divisors is an integer number (260346).

2⁵²⁰⁶⁹¹ is an apocalyptic number.

520691 is a deficient number, since it is larger than the sum of its proper divisors (1).

520691 is an equidigital number, since it uses as much as digits as its factorization.

520691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 520691 is about 721.5892183230. The cubic root of 520691 is about 80.4501189122.

The spelling of 520691 in words is "five hundred twenty thousand, six hundred ninety-one".