508217993 has 4 divisors (see below), whose sum is σ = 508306128. Its totient is φ = 508129860.

The previous prime is 508217971. The next prime is 508218013. The reversal of 508217993 is 399712805.

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 508217993 - 2¹⁸ = 507955849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (508217923) 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, 34763 + ... + 47168.

It is an arithmetic number, because the mean of its divisors is an integer number (127076532).

Almost surely, 2^508217993 is an apocalyptic number.

It is an amenable number.

508217993 is a deficient number, since it is larger than the sum of its proper divisors (88135).

508217993 is an equidigital number, since it uses as much as digits as its factorization.

508217993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88134.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 508217993 is about 22543.6907581700. The cubic root of 508217993 is about 798.0253345684.

The spelling of 508217993 in words is "five hundred eight million, two hundred seventeen thousand, nine hundred ninety-three".