155304225 has 36 divisors (see below), whose sum is σ = 282906000. Its totient is φ = 81418080.

The previous prime is 155304223. The next prime is 155304263. The reversal of 155304225 is 522403551.

It is a happy number.

It is not a de Polignac number, because 155304225 - 2¹ = 155304223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155304221) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7426 + ... + 19124.

It is an arithmetic number, because the mean of its divisors is an integer number (7858500).

Almost surely, 2^155304225 is an apocalyptic number.

155304225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155304225 is a deficient number, since it is larger than the sum of its proper divisors (127601775).

155304225 is a wasteful number, since it uses less digits than its factorization.

155304225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11774 (or 11766 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 155304225 is about 12462.1115787013. Note that the first 3 decimals coincide. The cubic root of 155304225 is about 537.5197468858.

Adding to 155304225 its reverse (522403551), we get a palindrome (677707776).

The spelling of 155304225 in words is "one hundred fifty-five million, three hundred four thousand, two hundred twenty-five".