5181209 has 16 divisors (see below), whose sum is σ = 6065280. Its totient is φ = 4373760.

The previous prime is 5181191. The next prime is 5181217. The reversal of 5181209 is 9021815.

It is a happy number.

It is not a de Polignac number, because 5181209 - 2⁸ = 5180953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5181269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19127 + ... + 19395.

It is an arithmetic number, because the mean of its divisors is an integer number (379080).

Almost surely, 2^5181209 is an apocalyptic number.

It is an amenable number.

5181209 is a deficient number, since it is larger than the sum of its proper divisors (884071).

5181209 is a wasteful number, since it uses less digits than its factorization.

5181209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 5181209 is about 2276.2269219039. The cubic root of 5181209 is about 173.0388833045.

Subtracting 5181209 from its reverse (9021815), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 5181209 in words is "five million, one hundred eighty-one thousand, two hundred nine".