5145806809 has 30 divisors (see below), whose sum is σ = 6131577970. Its totient is φ = 4315259520.

The previous prime is 5145806801. The next prime is 5145806819. The reversal of 5145806809 is 9086085415.

It can be written as a sum of positive squares in 5 ways, for example, as 4843742409 + 302064400 = 69597^2 + 17380^2 .

It is not a de Polignac number, because 5145806809 - 2³ = 5145806801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5145806801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 3455137 + ... + 3456625.

Almost surely, 2^5145806809 is an apocalyptic number.

It is an amenable number.

5145806809 is a deficient number, since it is larger than the sum of its proper divisors (985771161).

5145806809 is an equidigital number, since it uses as much as digits as its factorization.

5145806809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563 (or 1513 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 46.

The square root of 5145806809 is about 71734.2791766949. The cubic root of 5145806809 is about 1726.4386859587.

The spelling of 5145806809 in words is "five billion, one hundred forty-five million, eight hundred six thousand, eight hundred nine".