519949 has 4 divisors (see below), whose sum is σ = 521536. Its totient is φ = 518364.

The previous prime is 519947. The next prime is 519971. The reversal of 519949 is 949915.

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: 949915 = 5 ⋅189983.

It is a cyclic number.

It is not a de Polignac number, because 519949 - 2¹ = 519947 is a prime.

It is an Ulam number.

It is a Duffinian number.

519949 is a lucky number.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (519943) 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, 99 + ... + 1024.

It is an arithmetic number, because the mean of its divisors is an integer number (130384).

2⁵¹⁹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

519949 is a deficient number, since it is larger than the sum of its proper divisors (1587).

519949 is a wasteful number, since it uses less digits than its factorization.

519949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586.

The product of its digits is 14580, while the sum is 37.

The square root of 519949 is about 721.0748920882. The cubic root of 519949 is about 80.4118861498.

It can be divided in two parts, 51994 and 9, that added together give a triangular number (52003 = T₃₂₂).

The spelling of 519949 in words is "five hundred nineteen thousand, nine hundred forty-nine".