520398491 has 2 divisors, whose sum is σ = 520398492. Its totient is φ = 520398490.

The previous prime is 520398421. The next prime is 520398497. The reversal of 520398491 is 194893025.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 520398491 - 2²² = 516204187 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (520398497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260199245 + 260199246.

It is an arithmetic number, because the mean of its divisors is an integer number (260199246).

Almost surely, 2^520398491 is an apocalyptic number.

520398491 is a deficient number, since it is larger than the sum of its proper divisors (1).

520398491 is an equidigital number, since it uses as much as digits as its factorization.

520398491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 520398491 is about 22812.2443218549. The cubic root of 520398491 is about 804.3505124775.

The spelling of 520398491 in words is "five hundred twenty million, three hundred ninety-eight thousand, four hundred ninety-one".