2581209925 has 24 divisors (see below), whose sum is σ = 3691529600. Its totient is φ = 1753721280.

The previous prime is 2581209919. The next prime is 2581209929. The reversal of 2581209925 is 5299021852.

It is not a de Polignac number, because 2581209925 - 2²⁹ = 2044339013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581209929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48585 + ... + 86734.

Almost surely, 2^2581209925 is an apocalyptic number.

2581209925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2581209925 is a deficient number, since it is larger than the sum of its proper divisors (1110319675).

2581209925 is a wasteful number, since it uses less digits than its factorization.

2581209925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135445 (or 135440 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 2581209925 is about 50805.6091883564. The cubic root of 2581209925 is about 1371.7483362110.

The spelling of 2581209925 in words is "two billion, five hundred eighty-one million, two hundred nine thousand, nine hundred twenty-five".