5121044809 has 4 divisors (see below), whose sum is σ = 5121214740. Its totient is φ = 5120874880.

The previous prime is 5121044791. The next prime is 5121044821. The reversal of 5121044809 is 9084401215.

It is a happy number.

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 1179716409 + 3941328400 = 34347^2 + 62780^2 .

It is a cyclic number.

It is not a de Polignac number, because 5121044809 - 2²¹ = 5118947657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5121044849) 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, 26224 + ... + 104545.

It is an arithmetic number, because the mean of its divisors is an integer number (1280303685).

Almost surely, 2^5121044809 is an apocalyptic number.

It is an amenable number.

5121044809 is a deficient number, since it is larger than the sum of its proper divisors (169931).

5121044809 is a wasteful number, since it uses less digits than its factorization.

5121044809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169930.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 5121044809 is about 71561.4757324079. The cubic root of 5121044809 is about 1723.6649822160.

The spelling of 5121044809 in words is "five billion, one hundred twenty-one million, forty-four thousand, eight hundred nine".