5431247809 has 9 divisors (see below), whose sum is σ = 5882211273. Its totient is φ = 5012575152.

The previous prime is 5431247747. The next prime is 5431247813. The reversal of 5431247809 is 9087421345.

The square root of 5431247809 is 73697.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 2058890625 + 3372357184 = 45375^2 + 58072^2 .

It is not a de Polignac number, because 5431247809 - 2⁷ = 5431247681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5431247849) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 955227 + ... + 960895.

Almost surely, 2^5431247809 is an apocalyptic number.

5431247809 is the 73697-th square number.

5431247809 is the 36849-th centered octagonal number.

It is an amenable number.

5431247809 is a deficient number, since it is larger than the sum of its proper divisors (450963464).

5431247809 is an frugal number, since it uses more digits than its factorization.

5431247809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11364 (or 5682 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The cubic root of 5431247809 is about 1757.7881789402.

The spelling of 5431247809 in words is "five billion, four hundred thirty-one million, two hundred forty-seven thousand, eight hundred nine".