135206291225 has 24 divisors (see below), whose sum is σ = 168302888640. Its totient is φ = 107748355520.

The previous prime is 135206291221. The next prime is 135206291243. The reversal of 135206291225 is 522192602531.

It is not a de Polignac number, because 135206291225 - 2² = 135206291221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135206291221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7156091 + ... + 7174959.

It is an arithmetic number, because the mean of its divisors is an integer number (7012620360).

Almost surely, 2^135206291225 is an apocalyptic number.

It is an amenable number.

135206291225 is a deficient number, since it is larger than the sum of its proper divisors (33096597415).

135206291225 is a wasteful number, since it uses less digits than its factorization.

135206291225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19969 (or 19964 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 38.

Adding to 135206291225 its reverse (522192602531), we get a palindrome (657398893756).

The spelling of 135206291225 in words is "one hundred thirty-five billion, two hundred six million, two hundred ninety-one thousand, two hundred twenty-five".