520978699 has 4 divisors (see below), whose sum is σ = 521028936. Its totient is φ = 520928464.

The previous prime is 520978697. The next prime is 520978723. The reversal of 520978699 is 996879025.

520978699 = T₁₈₆₃₅ + T₁₈₆₃₆ + T₁₈₆₃₇.

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 is a cyclic number.

It is not a de Polignac number, because 520978699 - 2¹ = 520978697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520978697) 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, 3169 + ... + 32434.

It is an arithmetic number, because the mean of its divisors is an integer number (130257234).

Almost surely, 2^520978699 is an apocalyptic number.

520978699 is the 18637-th centered triangular number.

520978699 is a deficient number, since it is larger than the sum of its proper divisors (50237).

520978699 is a wasteful number, since it uses less digits than its factorization.

520978699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50236.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The square root of 520978699 is about 22824.9578093805. The cubic root of 520978699 is about 804.6493330129.

The spelling of 520978699 in words is "five hundred twenty million, nine hundred seventy-eight thousand, six hundred ninety-nine".