5145209 has 4 divisors (see below), whose sum is σ = 5322660. Its totient is φ = 4967760.

The previous prime is 5145197. The next prime is 5145211. The reversal of 5145209 is 9025415.

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 1428025 + 3717184 = 1195^2 + 1928^2 .

It is a cyclic number.

It is not a de Polignac number, because 5145209 - 2¹⁶ = 5079673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5145269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88682 + ... + 88739.

It is an arithmetic number, because the mean of its divisors is an integer number (1330665).

Almost surely, 2^5145209 is an apocalyptic number.

It is an amenable number.

5145209 is a deficient number, since it is larger than the sum of its proper divisors (177451).

5145209 is a wasteful number, since it uses less digits than its factorization.

5145209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177450.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 5145209 is about 2268.3053145465. The cubic root of 5145209 is about 172.6371827603.

The spelling of 5145209 in words is "five million, one hundred forty-five thousand, two hundred nine".