5126509 has 4 divisors (see below), whose sum is σ = 5156316. Its totient is φ = 5096704.

The previous prime is 5126497. The next prime is 5126543. The reversal of 5126509 is 9056215.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4937284 + 189225 = 2222^2 + 435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5126509 is a prime.

It is a Duffinian number.

5126509 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5126549) 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, 14644 + ... + 14989.

It is an arithmetic number, because the mean of its divisors is an integer number (1289079).

Almost surely, 2^5126509 is an apocalyptic number.

It is an amenable number.

5126509 is a deficient number, since it is larger than the sum of its proper divisors (29807).

5126509 is a wasteful number, since it uses less digits than its factorization.

5126509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29806.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 5126509 is about 2264.1795423508. The cubic root of 5126509 is about 172.4277818540.

It can be divided in two parts, 512 and 6509, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 5126509 in words is "five million, one hundred twenty-six thousand, five hundred nine".