155255225 has 6 divisors (see below), whose sum is σ = 192516510. Its totient is φ = 124204160.

The previous prime is 155255209. The next prime is 155255227. The reversal of 155255225 is 522552551.

It can be written as a sum of positive squares in 3 ways, for example, as 31956409 + 123298816 = 5653^2 + 11104^2 .

It is not a de Polignac number, because 155255225 - 2⁴ = 155255209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155255191 and 155255200.

It is not an unprimeable number, because it can be changed into a prime (155255227) 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, 3105080 + ... + 3105129.

It is an arithmetic number, because the mean of its divisors is an integer number (32086085).

Almost surely, 2^155255225 is an apocalyptic number.

It is an amenable number.

155255225 is a deficient number, since it is larger than the sum of its proper divisors (37261285).

155255225 is an equidigital number, since it uses as much as digits as its factorization.

155255225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6210219 (or 6210214 counting only the distinct ones).

The product of its digits is 25000, while the sum is 32.

The square root of 155255225 is about 12460.1454646405. The cubic root of 155255225 is about 537.4632100292.

The spelling of 155255225 in words is "one hundred fifty-five million, two hundred fifty-five thousand, two hundred twenty-five".