217988125 has 20 divisors (see below), whose sum is σ = 281209984. Its totient is φ = 168750000.

The previous prime is 217988123. The next prime is 217988143. The reversal of 217988125 is 521889712.

It is a happy number.

It is not a de Polignac number, because 217988125 - 2¹ = 217988123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217988123) 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 19 ways as a sum of consecutive naturals, for example, 13750 + ... + 25000.

Almost surely, 2^217988125 is an apocalyptic number.

217988125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

217988125 is a deficient number, since it is larger than the sum of its proper divisors (63221859).

217988125 is an equidigital number, since it uses as much as digits as its factorization.

217988125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11302 (or 11287 counting only the distinct ones).

The product of its digits is 80640, while the sum is 43.

The square root of 217988125 is about 14764.4209165141. The cubic root of 217988125 is about 601.8352372651.

The spelling of 217988125 in words is "two hundred seventeen million, nine hundred eighty-eight thousand, one hundred twenty-five".