210685225 has 9 divisors (see below), whose sum is σ = 261339703. Its totient is φ = 168490120.

The previous prime is 210685217. The next prime is 210685231. The reversal of 210685225 is 522586012.

The square root of 210685225 is 14515.

It is a perfect power (a square), and thus also a powerful number.

210685225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 75846681 + 134838544 = 8709^2 + 11612^2 .

It is not a de Polignac number, because 210685225 - 2³ = 210685217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 71124 + ... + 74026.

Almost surely, 2^210685225 is an apocalyptic number.

210685225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

210685225 is the 14515-th square number.

210685225 is the 7258-th centered octagonal number.

It is an amenable number.

210685225 is a deficient number, since it is larger than the sum of its proper divisors (50654478).

210685225 is an frugal number, since it uses more digits than its factorization.

210685225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5816 (or 2908 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The cubic root of 210685225 is about 595.0379892417.

The spelling of 210685225 in words is "two hundred ten million, six hundred eighty-five thousand, two hundred twenty-five".