513136644 has 12 divisors (see below), whose sum is σ = 1197318864. Its totient is φ = 171045544.

The previous prime is 513136633. The next prime is 513136649. The reversal of 513136644 is 446631315.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (513136649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21380682 + ... + 21380705.

It is an arithmetic number, because the mean of its divisors is an integer number (99776572).

Almost surely, 2^513136644 is an apocalyptic number.

It is an amenable number.

513136644 is an abundant number, since it is smaller than the sum of its proper divisors (684182220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

513136644 is a wasteful number, since it uses less digits than its factorization.

513136644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42761394 (or 42761392 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 513136644 is about 22652.5195949590. The cubic root of 513136644 is about 800.5915645398.

Adding to 513136644 its reverse (446631315), we get a palindrome (959767959).

The spelling of 513136644 in words is "five hundred thirteen million, one hundred thirty-six thousand, six hundred forty-four".