520981999 has 8 divisors (see below), whose sum is σ = 525692160. Its totient is φ = 516293400.

The previous prime is 520981987. The next prime is 520982041. The reversal of 520981999 is 999189025.

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 520981999 - 2¹⁹ = 520457711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520981199) by changing a digit.

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, 45264 + ... + 55594.

It is an arithmetic number, because the mean of its divisors is an integer number (65711520).

Almost surely, 2^520981999 is an apocalyptic number.

520981999 is a deficient number, since it is larger than the sum of its proper divisors (4710161).

520981999 is a wasteful number, since it uses less digits than its factorization.

520981999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10781.

The product of its (nonzero) digits is 524880, while the sum is 52.

The square root of 520981999 is about 22825.0300985563. The cubic root of 520981999 is about 804.6510319545.

The spelling of 520981999 in words is "five hundred twenty million, nine hundred eighty-one thousand, nine hundred ninety-nine".