181228025 has 12 divisors (see below), whose sum is σ = 245152464. Its totient is φ = 131802000.

The previous prime is 181228001. The next prime is 181228027. The reversal of 181228025 is 520822181.

It is a happy number.

It is not a de Polignac number, because 181228025 - 2²⁰ = 180179449 is a prime.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (181228027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 329231 + ... + 329780.

It is an arithmetic number, because the mean of its divisors is an integer number (20429372).

Almost surely, 2^181228025 is an apocalyptic number.

It is an amenable number.

181228025 is a deficient number, since it is larger than the sum of its proper divisors (63924439).

181228025 is a wasteful number, since it uses less digits than its factorization.

181228025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659032 (or 659027 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 181228025 is about 13462.0958620863. The cubic root of 181228025 is about 565.9027258571.

The spelling of 181228025 in words is "one hundred eighty-one million, two hundred twenty-eight thousand, twenty-five".