135220225 has 48 divisors (see below), whose sum is σ = 199272960. Its totient is φ = 89107200.

The previous prime is 135220201. The next prime is 135220229. The reversal of 135220225 is 522022531.

It is not a de Polignac number, because 135220225 - 2⁷ = 135220097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135220196 and 135220205.

It is not an unprimeable number, because it can be changed into a prime (135220229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 565656 + ... + 565894.

It is an arithmetic number, because the mean of its divisors is an integer number (4151520).

Almost surely, 2^135220225 is an apocalyptic number.

It is an amenable number.

135220225 is a deficient number, since it is larger than the sum of its proper divisors (64052735).

135220225 is a wasteful number, since it uses less digits than its factorization.

135220225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 135220225 is about 11628.4231519153. The cubic root of 135220225 is about 513.2715802010.

Adding to 135220225 its reverse (522022531), we get a palindrome (657242756).

The spelling of 135220225 in words is "one hundred thirty-five million, two hundred twenty thousand, two hundred twenty-five".