513644225 has 6 divisors (see below), whose sum is σ = 636918870. Its totient is φ = 410915360.

The previous prime is 513644203. The next prime is 513644231. The reversal of 513644225 is 522446315.

It can be written as a sum of positive squares in 3 ways, for example, as 54656449 + 458987776 = 7393^2 + 21424^2 .

It is not a de Polignac number, because 513644225 - 2⁶ = 513644161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 513644191 and 513644200.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10272860 + ... + 10272909.

It is an arithmetic number, because the mean of its divisors is an integer number (106153145).

Almost surely, 2^513644225 is an apocalyptic number.

It is an amenable number.

513644225 is a deficient number, since it is larger than the sum of its proper divisors (123274645).

513644225 is a wasteful number, since it uses less digits than its factorization.

513644225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20545779 (or 20545774 counting only the distinct ones).

The product of its digits is 28800, while the sum is 32.

The square root of 513644225 is about 22663.7204580360. The cubic root of 513644225 is about 800.8554521136.

The spelling of 513644225 in words is "five hundred thirteen million, six hundred forty-four thousand, two hundred twenty-five".