516327991 has 8 divisors (see below), whose sum is σ = 518676480. Its totient is φ = 513985752.

The previous prime is 516327953. The next prime is 516328003. The reversal of 516327991 is 199723615.

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 516327991 - 2¹⁹ = 515803703 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 (516327901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239866 + ... + 242008.

It is an arithmetic number, because the mean of its divisors is an integer number (64834560).

Almost surely, 2^516327991 is an apocalyptic number.

516327991 is a deficient number, since it is larger than the sum of its proper divisors (2348489).

516327991 is a wasteful number, since it uses less digits than its factorization.

516327991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125.

The product of its digits is 102060, while the sum is 43.

The square root of 516327991 is about 22722.8517356427. The cubic root of 516327991 is about 802.2478400823.

The spelling of 516327991 in words is "five hundred sixteen million, three hundred twenty-seven thousand, nine hundred ninety-one".