2125504809 has 12 divisors (see below), whose sum is σ = 3070969200. Its totient is φ = 1416636024.

The previous prime is 2125504793. The next prime is 2125504813. The reversal of 2125504809 is 9084055212.

2125504809 is a `hidden beast` number, since 2 + 125 + 50 + 480 + 9 = 666.

It is not a de Polignac number, because 2125504809 - 2⁴ = 2125504793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2125504889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8722 + ... + 65780.

It is an arithmetic number, because the mean of its divisors is an integer number (255914100).

Almost surely, 2^2125504809 is an apocalyptic number.

It is an amenable number.

2125504809 is a deficient number, since it is larger than the sum of its proper divisors (945464391).

2125504809 is a wasteful number, since it uses less digits than its factorization.

2125504809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61204 (or 61201 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 2125504809 is about 46103.1973836956. The cubic root of 2125504809 is about 1285.7425916678.

The spelling of 2125504809 in words is "two billion, one hundred twenty-five million, five hundred four thousand, eight hundred nine".