520615489 has 3 divisors (see below), whose sum is σ = 520638307. Its totient is φ = 520592672.

The previous prime is 520615483. The next prime is 520615507. The reversal of 520615489 is 984516025.

The square root of 520615489 is 22817.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 519156225 + 1459264 = 22785^2 + 1208^2 .

It is not a de Polignac number, because 520615489 - 2²¹ = 518518337 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520615483) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 11409 + ... + 34225.

Almost surely, 2^520615489 is an apocalyptic number.

520615489 is the 22817-th square number.

520615489 is the 11409-th centered octagonal number.

It is an amenable number.

520615489 is a deficient number, since it is larger than the sum of its proper divisors (22818).

520615489 is an frugal number, since it uses more digits than its factorization.

520615489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45634 (or 22817 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The cubic root of 520615489 is about 804.4622974530.

The spelling of 520615489 in words is "five hundred twenty million, six hundred fifteen thousand, four hundred eighty-nine".