518993845 has 4 divisors (see below), whose sum is σ = 622792620. Its totient is φ = 415195072.

The previous prime is 518993843. The next prime is 518993851. The reversal of 518993845 is 548399815.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111640356 + 407353489 = 10566^2 + 20183^2 .

It is a cyclic number.

It is not a de Polignac number, because 518993845 - 2¹ = 518993843 is a prime.

It is a super-2 number, since 2×518993845² = 538709222295768050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 518993792 and 518993801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518993843) 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, 51899380 + ... + 51899389.

It is an arithmetic number, because the mean of its divisors is an integer number (155698155).

Almost surely, 2^518993845 is an apocalyptic number.

It is an amenable number.

518993845 is a deficient number, since it is larger than the sum of its proper divisors (103798775).

518993845 is a wasteful number, since it uses less digits than its factorization.

518993845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103798774.

The product of its digits is 1555200, while the sum is 52.

The square root of 518993845 is about 22781.4364121317. The cubic root of 518993845 is about 803.6261664168.

The spelling of 518993845 in words is "five hundred eighteen million, nine hundred ninety-three thousand, eight hundred forty-five".