520904477 has 4 divisors (see below), whose sum is σ = 521006460. Its totient is φ = 520802496.

The previous prime is 520904471. The next prime is 520904519. The reversal of 520904477 is 774409025.

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

It can be written as a sum of positive squares in 2 ways, for example, as 259403236 + 261501241 = 16106^2 + 16171^2 .

It is a cyclic number.

It is not a de Polignac number, because 520904477 - 2⁶ = 520904413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520904477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520904471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42902 + ... + 53687.

It is an arithmetic number, because the mean of its divisors is an integer number (130251615).

Almost surely, 2^520904477 is an apocalyptic number.

It is an amenable number.

520904477 is a deficient number, since it is larger than the sum of its proper divisors (101983).

520904477 is an equidigital number, since it uses as much as digits as its factorization.

520904477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101982.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 520904477 is about 22823.3318558005. The cubic root of 520904477 is about 804.6111193461.

The spelling of 520904477 in words is "five hundred twenty million, nine hundred four thousand, four hundred seventy-seven".