513523254444 has 12 divisors (see below), whose sum is σ = 1198220927064. Its totient is φ = 171174418144.

The previous prime is 513523254359. The next prime is 513523254473. The reversal of 513523254444 is 444452325315.

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

It is a super-2 number, since 2×513523254444² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 513523254396 and 513523254405.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21396802257 + ... + 21396802280.

It is an arithmetic number, because the mean of its divisors is an integer number (99851743922).

Almost surely, 2^513523254444 is an apocalyptic number.

It is an amenable number.

513523254444 is an abundant number, since it is smaller than the sum of its proper divisors (684697672620).

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

513523254444 is a wasteful number, since it uses less digits than its factorization.

513523254444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42793604544 (or 42793604542 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 42.

Adding to 513523254444 its reverse (444452325315), we get a palindrome (957975579759).

The spelling of 513523254444 in words is "five hundred thirteen billion, five hundred twenty-three million, two hundred fifty-four thousand, four hundred forty-four".