513004561 has 4 divisors (see below), whose sum is σ = 513443824. Its totient is φ = 512565300.

The previous prime is 513004537. The next prime is 513004573. The reversal of 513004561 is 165400315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165400315 = 5 ⋅33080063.

It is a cyclic number.

It is not a de Polignac number, because 513004561 - 2⁹ = 513004049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513002561) 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, 217875 + ... + 220216.

It is an arithmetic number, because the mean of its divisors is an integer number (128360956).

Almost surely, 2^513004561 is an apocalyptic number.

It is an amenable number.

513004561 is a deficient number, since it is larger than the sum of its proper divisors (439263).

513004561 is a wasteful number, since it uses less digits than its factorization.

513004561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439262.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 513004561 is about 22649.6039921231. The cubic root of 513004561 is about 800.5228670423.

Adding to 513004561 its reverse (165400315), we get a palindrome (678404876).

The spelling of 513004561 in words is "five hundred thirteen million, four thousand, five hundred sixty-one".