518890613 has 4 divisors (see below), whose sum is σ = 519054540. Its totient is φ = 518726688.

The previous prime is 518890597. The next prime is 518890633. The reversal of 518890613 is 316098815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 316098815 = 5 ⋅63219763.

It can be written as a sum of positive squares in 2 ways, for example, as 226412209 + 292478404 = 15047^2 + 17102^2 .

It is a cyclic number.

It is not a de Polignac number, because 518890613 - 2⁴ = 518890597 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 (518890633) 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, 77120 + ... + 83577.

It is an arithmetic number, because the mean of its divisors is an integer number (129763635).

Almost surely, 2^518890613 is an apocalyptic number.

It is an amenable number.

518890613 is a deficient number, since it is larger than the sum of its proper divisors (163927).

518890613 is a wasteful number, since it uses less digits than its factorization.

518890613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163926.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 518890613 is about 22779.1705950853. The cubic root of 518890613 is about 803.5728803401.

The spelling of 518890613 in words is "five hundred eighteen million, eight hundred ninety thousand, six hundred thirteen".