520149965 has 4 divisors (see below), whose sum is σ = 624179964. Its totient is φ = 416119968.

The previous prime is 520149943. The next prime is 520149977. The reversal of 520149965 is 569941025.

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 349951849 + 170198116 = 18707^2 + 13046^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520149965 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52014992 + ... + 52015001.

It is an arithmetic number, because the mean of its divisors is an integer number (156044991).

Almost surely, 2^520149965 is an apocalyptic number.

It is an amenable number.

520149965 is a deficient number, since it is larger than the sum of its proper divisors (104029999).

520149965 is a wasteful number, since it uses less digits than its factorization.

520149965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104029998.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 520149965 is about 22806.7964650891. The cubic root of 520149965 is about 804.2224478952. Note that the first 3 decimals are identical.

The spelling of 520149965 in words is "five hundred twenty million, one hundred forty-nine thousand, nine hundred sixty-five".