1215162225 has 18 divisors (see below), whose sum is σ = 2176490966. Its totient is φ = 648086400.

The previous prime is 1215162203. The next prime is 1215162253. The reversal of 1215162225 is 5222615121.

1215162225 is a `hidden beast` number, since 1 + 2 + 15 + 1 + 622 + 25 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 8503056 + 1206659169 = 2916^2 + 34737^2 .

It is not a de Polignac number, because 1215162225 - 2¹⁰ = 1215161201 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2700136 + ... + 2700585.

Almost surely, 2^1215162225 is an apocalyptic number.

1215162225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1215162225 is a deficient number, since it is larger than the sum of its proper divisors (961328741).

1215162225 is a wasteful number, since it uses less digits than its factorization.

1215162225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5400737 (or 5400729 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 1215162225 is about 34859.1770556908. The cubic root of 1215162225 is about 1067.1154803460.

Adding to 1215162225 its reverse (5222615121), we get a palindrome (6437777346).

The spelling of 1215162225 in words is "one billion, two hundred fifteen million, one hundred sixty-two thousand, two hundred twenty-five".