513673993 has 4 divisors (see below), whose sum is σ = 587056000. Its totient is φ = 440291988.

The previous prime is 513673967. The next prime is 513674009. The reversal of 513673993 is 399376315.

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 a de Polignac number, because none of the positive numbers 2^k-513673993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513673903) 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, 36690993 + ... + 36691006.

It is an arithmetic number, because the mean of its divisors is an integer number (146764000).

Almost surely, 2^513673993 is an apocalyptic number.

It is an amenable number.

513673993 is a deficient number, since it is larger than the sum of its proper divisors (73382007).

513673993 is an equidigital number, since it uses as much as digits as its factorization.

513673993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73382006.

The product of its digits is 459270, while the sum is 46.

The square root of 513673993 is about 22664.3771809419. The cubic root of 513673993 is about 800.8709228768.

The spelling of 513673993 in words is "five hundred thirteen million, six hundred seventy-three thousand, nine hundred ninety-three".