1215054225 has 216 divisors, whose sum is σ = 2838112992. Its totient is φ = 491097600.

The previous prime is 1215054221. The next prime is 1215054257. The reversal of 1215054225 is 5224505121.

It is not a de Polignac number, because 1215054225 - 2² = 1215054221 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215054221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 5214709 + ... + 5214941.

It is an arithmetic number, because the mean of its divisors is an integer number (13139412).

Almost surely, 2^1215054225 is an apocalyptic number.

1215054225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1215054225 is an abundant number, since it is smaller than the sum of its proper divisors (1623058767).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215054225 is a wasteful number, since it uses less digits than its factorization.

1215054225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 1215054225 is about 34857.6279313438. The cubic root of 1215054225 is about 1067.0838653940.

Adding to 1215054225 its reverse (5224505121), we get a palindrome (6439559346).

The spelling of 1215054225 in words is "one billion, two hundred fifteen million, fifty-four thousand, two hundred twenty-five".