138355225 has 6 divisors (see below), whose sum is σ = 171560510. Its totient is φ = 110684160.

The previous prime is 138355211. The next prime is 138355229. The reversal of 138355225 is 522553831.

It can be written as a sum of positive squares in 3 ways, for example, as 24890121 + 113465104 = 4989^2 + 10652^2 .

It is not a de Polignac number, because 138355225 - 2¹⁹ = 137830937 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138355229) 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, 2767080 + ... + 2767129.

Almost surely, 2^138355225 is an apocalyptic number.

It is an amenable number.

138355225 is a deficient number, since it is larger than the sum of its proper divisors (33205285).

138355225 is an equidigital number, since it uses as much as digits as its factorization.

138355225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5534219 (or 5534214 counting only the distinct ones).

The product of its digits is 36000, while the sum is 34.

The square root of 138355225 is about 11762.4497873530. The cubic root of 138355225 is about 517.2079458607.

The spelling of 138355225 in words is "one hundred thirty-eight million, three hundred fifty-five thousand, two hundred twenty-five".