2563625209 has 4 divisors (see below), whose sum is σ = 2574262900. Its totient is φ = 2552987520.

The previous prime is 2563625159. The next prime is 2563625249. The reversal of 2563625209 is 9025263652.

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 1198544400 + 1365080809 = 34620^2 + 36947^2 .

It is a cyclic number.

It is not a de Polignac number, because 2563625209 - 2¹⁷ = 2563494137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2563625249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5318484 + ... + 5318965.

It is an arithmetic number, because the mean of its divisors is an integer number (643565725).

Almost surely, 2^2563625209 is an apocalyptic number.

It is an amenable number.

2563625209 is a deficient number, since it is larger than the sum of its proper divisors (10637691).

2563625209 is a wasteful number, since it uses less digits than its factorization.

2563625209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10637690.

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 2563625209 is about 50632.2546308181. The cubic root of 2563625209 is about 1368.6261840448.

The spelling of 2563625209 in words is "two billion, five hundred sixty-three million, six hundred twenty-five thousand, two hundred nine".