513323561 has 4 divisors (see below), whose sum is σ = 513578832. Its totient is φ = 513068292.

The previous prime is 513323557. The next prime is 513323563. The reversal of 513323561 is 165323315.

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: 165323315 = 5 ⋅33064663.

It is a cyclic number.

It is not a de Polignac number, because 513323561 - 2² = 513323557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513323563) 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, 124595 + ... + 128648.

It is an arithmetic number, because the mean of its divisors is an integer number (128394708).

Almost surely, 2^513323561 is an apocalyptic number.

It is an amenable number.

513323561 is a deficient number, since it is larger than the sum of its proper divisors (255271).

513323561 is a wasteful number, since it uses less digits than its factorization.

513323561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255270.

The product of its digits is 8100, while the sum is 29.

The square root of 513323561 is about 22656.6449634539. The cubic root of 513323561 is about 800.6887615268.

Adding to 513323561 its reverse (165323315), we get a palindrome (678646876).

The spelling of 513323561 in words is "five hundred thirteen million, three hundred twenty-three thousand, five hundred sixty-one".