513855505 has 8 divisors (see below), whose sum is σ = 620555112. Its totient is φ = 408465408.

The previous prime is 513855487. The next prime is 513855509. The reversal of 513855505 is 505558315.

It can be written as a sum of positive squares in 4 ways, for example, as 12453841 + 501401664 = 3529^2 + 22392^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 513855505 - 2²¹ = 511758353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513855509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326512 + ... + 328081.

It is an arithmetic number, because the mean of its divisors is an integer number (77569389).

Almost surely, 2^513855505 is an apocalyptic number.

It is an amenable number.

513855505 is a deficient number, since it is larger than the sum of its proper divisors (106699607).

513855505 is a wasteful number, since it uses less digits than its factorization.

513855505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654755.

The product of its (nonzero) digits is 75000, while the sum is 37.

The square root of 513855505 is about 22668.3811729025. The cubic root of 513855505 is about 800.9652437664.

The spelling of 513855505 in words is "five hundred thirteen million, eight hundred fifty-five thousand, five hundred five".