520989655 has 8 divisors (see below), whose sum is σ = 634519152. Its totient is φ = 410570688.

The previous prime is 520989607. The next prime is 520989683. The reversal of 520989655 is 556989025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 520989655 - 2⁹ = 520989143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520989599 and 520989608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 777262 + ... + 777931.

It is an arithmetic number, because the mean of its divisors is an integer number (79314894).

Almost surely, 2^520989655 is an apocalyptic number.

520989655 is a deficient number, since it is larger than the sum of its proper divisors (113529497).

520989655 is a wasteful number, since it uses less digits than its factorization.

520989655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555265.

The product of its (nonzero) digits is 972000, while the sum is 49.

The square root of 520989655 is about 22825.1978085624. The cubic root of 520989655 is about 804.6549734714.

It can be divided in two parts, 5209 and 89655, that added together give a square (94864 = 308²).

The spelling of 520989655 in words is "five hundred twenty million, nine hundred eighty-nine thousand, six hundred fifty-five".