155302225 has 24 divisors (see below), whose sum is σ = 219595320. Its totient is φ = 107934720.

The previous prime is 155302223. The next prime is 155302247. The reversal of 155302225 is 522203551.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 102070609 + 53231616 = 10103^2 + 7296^2 .

It is not a de Polignac number, because 155302225 - 2¹ = 155302223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 155302225.

It is not an unprimeable number, because it can be changed into a prime (155302223) 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, 8530 + ... + 19579.

It is an arithmetic number, because the mean of its divisors is an integer number (9149805).

Almost surely, 2^155302225 is an apocalyptic number.

It is an amenable number.

155302225 is a deficient number, since it is larger than the sum of its proper divisors (64293095).

155302225 is a wasteful number, since it uses less digits than its factorization.

155302225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28149 (or 28144 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 155302225 is about 12462.0313352198. The cubic root of 155302225 is about 537.5174394918.

Adding to 155302225 its reverse (522203551), we get a palindrome (677505776).

The spelling of 155302225 in words is "one hundred fifty-five million, three hundred two thousand, two hundred twenty-five".