520616991 has 8 divisors (see below), whose sum is σ = 696254464. Its totient is φ = 346028760.

The previous prime is 520616977. The next prime is 520617011. The reversal of 520616991 is 199616025.

520616991 is nontrivially palindromic in base 2.

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

It is not a de Polignac number, because 520616991 - 2⁹ = 520616479 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520606991) 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, 261151 + ... + 263136.

It is an arithmetic number, because the mean of its divisors is an integer number (87031808).

Almost surely, 2^520616991 is an apocalyptic number.

520616991 is a deficient number, since it is larger than the sum of its proper divisors (175637473).

520616991 is a wasteful number, since it uses less digits than its factorization.

520616991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524621.

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 520616991 is about 22817.0329140316. The cubic root of 520616991 is about 804.4630710894.

The spelling of 520616991 in words is "five hundred twenty million, six hundred sixteen thousand, nine hundred ninety-one".