518505949 has 4 divisors (see below), whose sum is σ = 558391036. Its totient is φ = 478620864.

The previous prime is 518505947. The next prime is 518505989. The reversal of 518505949 is 949505815.

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 159213924 + 359292025 = 12618^2 + 18955^2 .

It is a cyclic number.

It is not a de Polignac number, because 518505949 - 2¹ = 518505947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 518505899 and 518505908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518505947) 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, 19942524 + ... + 19942549.

It is an arithmetic number, because the mean of its divisors is an integer number (139597759).

Almost surely, 2^518505949 is an apocalyptic number.

It is an amenable number.

518505949 is a deficient number, since it is larger than the sum of its proper divisors (39885087).

518505949 is a wasteful number, since it uses less digits than its factorization.

518505949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39885086.

The product of its (nonzero) digits is 324000, while the sum is 46.

The square root of 518505949 is about 22770.7257020939. The cubic root of 518505949 is about 803.3742630309.

The spelling of 518505949 in words is "five hundred eighteen million, five hundred five thousand, nine hundred forty-nine".