513649 has 2 divisors, whose sum is σ = 513650. Its totient is φ = 513648.

The previous prime is 513641. The next prime is 513673. The reversal of 513649 is 946315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 378225 + 135424 = 615^2 + 368^2 .

It is a cyclic number.

It is not a de Polignac number, because 513649 - 2³ = 513641 is a prime.

It is not a weakly prime, because it can be changed into another prime (513641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256824 + 256825.

It is an arithmetic number, because the mean of its divisors is an integer number (256825).

2⁵¹³⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

513649 is a deficient number, since it is larger than the sum of its proper divisors (1).

513649 is an equidigital number, since it uses as much as digits as its factorization.

513649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 28.

The square root of 513649 is about 716.6931002877. The cubic root of 513649 is about 80.0857933775.

The spelling of 513649 in words is "five hundred thirteen thousand, six hundred forty-nine".