517813997 has 4 divisors (see below), whose sum is σ = 517882176. Its totient is φ = 517745820.

The previous prime is 517813991. The next prime is 517814029. The reversal of 517813997 is 799318715.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 517813997 - 2¹⁴ = 517797613 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 (517813991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21029 + ... + 38442.

It is an arithmetic number, because the mean of its divisors is an integer number (129470544).

Almost surely, 2^517813997 is an apocalyptic number.

It is an amenable number.

517813997 is a deficient number, since it is larger than the sum of its proper divisors (68179).

517813997 is an equidigital number, since it uses as much as digits as its factorization.

517813997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68178.

The product of its digits is 476280, while the sum is 50.

The square root of 517813997 is about 22755.5267352791. The cubic root of 517813997 is about 803.0167332887.

The spelling of 517813997 in words is "five hundred seventeen million, eight hundred thirteen thousand, nine hundred ninety-seven".