2173987225 has 12 divisors (see below), whose sum is σ = 2719603836. Its totient is φ = 1723796480.

The previous prime is 2173987223. The next prime is 2173987229. The reversal of 2173987225 is 5227893712.

It can be written as a sum of positive squares in 6 ways, for example, as 104101209 + 2069886016 = 10203^2 + 45496^2 .

It is not a de Polignac number, because 2173987225 - 2¹ = 2173987223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2173987223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 381952 + ... + 387601.

It is an arithmetic number, because the mean of its divisors is an integer number (226633653).

Almost surely, 2^2173987225 is an apocalyptic number.

2173987225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2173987225 is a deficient number, since it is larger than the sum of its proper divisors (545616611).

2173987225 is a wasteful number, since it uses less digits than its factorization.

2173987225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769676 (or 769671 counting only the distinct ones).

The product of its digits is 423360, while the sum is 46.

The square root of 2173987225 is about 46626.0359134250. The cubic root of 2173987225 is about 1295.4450500960.

The spelling of 2173987225 in words is "two billion, one hundred seventy-three million, nine hundred eighty-seven thousand, two hundred twenty-five".