216136225 has 6 divisors (see below), whose sum is σ = 268008950. Its totient is φ = 172908960.

The previous prime is 216136223. The next prime is 216136241. The reversal of 216136225 is 522631612.

216136225 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 74787904 + 141348321 = 8648^2 + 11889^2 .

It is not a de Polignac number, because 216136225 - 2¹ = 216136223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216136193 and 216136202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216136223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4322700 + ... + 4322749.

Almost surely, 2^216136225 is an apocalyptic number.

216136225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216136225 is a deficient number, since it is larger than the sum of its proper divisors (51872725).

216136225 is an equidigital number, since it uses as much as digits as its factorization.

216136225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8645459 (or 8645454 counting only the distinct ones).

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

The square root of 216136225 is about 14701.5721948369. The cubic root of 216136225 is about 600.1261077521.

Adding to 216136225 its reverse (522631612), we get a palindrome (738767837).

The spelling of 216136225 in words is "two hundred sixteen million, one hundred thirty-six thousand, two hundred twenty-five".