513838749 has 4 divisors (see below), whose sum is σ = 685118336. Its totient is φ = 342559164.

The previous prime is 513838747. The next prime is 513838769. The reversal of 513838749 is 947838315.

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.

It is not a de Polignac number, because 513838749 - 2¹ = 513838747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 513838698 and 513838707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513838747) 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, 85639789 + ... + 85639794.

It is an arithmetic number, because the mean of its divisors is an integer number (171279584).

Almost surely, 2^513838749 is an apocalyptic number.

It is an amenable number.

513838749 is a deficient number, since it is larger than the sum of its proper divisors (171279587).

513838749 is a wasteful number, since it uses less digits than its factorization.

513838749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171279586.

The product of its digits is 725760, while the sum is 48.

The square root of 513838749 is about 22668.0115801982. The cubic root of 513838749 is about 800.9565376098.

The spelling of 513838749 in words is "five hundred thirteen million, eight hundred thirty-eight thousand, seven hundred forty-nine".