213616225 has 6 divisors (see below), whose sum is σ = 264884150. Its totient is φ = 170892960.

The previous prime is 213616211. The next prime is 213616253. The reversal of 213616225 is 522616312.

213616225 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 3 ways, for example, as 40246336 + 173369889 = 6344^2 + 13167^2 .

It is not a de Polignac number, because 213616225 - 2⁹ = 213615713 is a prime.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 213616193 and 213616202.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4272300 + ... + 4272349.

Almost surely, 2^213616225 is an apocalyptic number.

213616225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213616225 is a deficient number, since it is larger than the sum of its proper divisors (51267925).

213616225 is an equidigital number, since it uses as much as digits as its factorization.

213616225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8544659 (or 8544654 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 213616225 is about 14615.6157927061. The cubic root of 213616225 is about 597.7846312286.

The spelling of 213616225 in words is "two hundred thirteen million, six hundred sixteen thousand, two hundred twenty-five".