513231125623 has 4 divisors (see below), whose sum is σ = 513232716600. Its totient is φ = 513229534648.

The previous prime is 513231125599. The next prime is 513231125657. The reversal of 513231125623 is 326521132315.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513231125623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513231125683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120940 + ... + 1020337.

It is an arithmetic number, because the mean of its divisors is an integer number (128308179150).

Almost surely, 2^513231125623 is an apocalyptic number.

513231125623 is a deficient number, since it is larger than the sum of its proper divisors (1590977).

513231125623 is a wasteful number, since it uses less digits than its factorization.

513231125623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590976.

The product of its digits is 32400, while the sum is 34.

Adding to 513231125623 its reverse (326521132315), we get a palindrome (839752257938).

The spelling of 513231125623 in words is "five hundred thirteen billion, two hundred thirty-one million, one hundred twenty-five thousand, six hundred twenty-three".