520505491 has 4 divisors (see below), whose sum is σ = 567824184. Its totient is φ = 473186800.

The previous prime is 520505443. The next prime is 520505539. The reversal of 520505491 is 194505025.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (520505443) and next prime (520505539).

It is a cyclic number.

It is not a de Polignac number, because 520505491 - 2¹⁵ = 520472723 is a prime.

It is a super-2 number, since 2×520505491² = 541851932322302162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520503491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23659330 + ... + 23659351.

It is an arithmetic number, because the mean of its divisors is an integer number (141956046).

Almost surely, 2^520505491 is an apocalyptic number.

520505491 is a deficient number, since it is larger than the sum of its proper divisors (47318693).

520505491 is a wasteful number, since it uses less digits than its factorization.

520505491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47318692.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 520505491 is about 22814.5894330799. The cubic root of 520505491 is about 804.4056366489.

The spelling of 520505491 in words is "five hundred twenty million, five hundred five thousand, four hundred ninety-one".