518611493 has 4 divisors (see below), whose sum is σ = 535340928. Its totient is φ = 501882060.

The previous prime is 518611451. The next prime is 518611543. The reversal of 518611493 is 394116815.

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 518611493 - 2¹⁴ = 518595109 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 (518614493) 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, 8364671 + ... + 8364732.

It is an arithmetic number, because the mean of its divisors is an integer number (133835232).

Almost surely, 2^518611493 is an apocalyptic number.

It is an amenable number.

518611493 is a deficient number, since it is larger than the sum of its proper divisors (16729435).

518611493 is a wasteful number, since it uses less digits than its factorization.

518611493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16729434.

The product of its digits is 25920, while the sum is 38.

The square root of 518611493 is about 22773.0431211992. The cubic root of 518611493 is about 803.4287693684.

The spelling of 518611493 in words is "five hundred eighteen million, six hundred eleven thousand, four hundred ninety-three".