1215523225 has 24 divisors (see below), whose sum is σ = 1724496768. Its totient is φ = 832569600.

The previous prime is 1215523189. The next prime is 1215523241. The reversal of 1215523225 is 5223255121.

It is not a de Polignac number, because 1215523225 - 2⁹ = 1215522713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1215523193 and 1215523202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177057 + ... + 183793.

It is an arithmetic number, because the mean of its divisors is an integer number (71854032).

Almost surely, 2^1215523225 is an apocalyptic number.

It is an amenable number.

1215523225 is a deficient number, since it is larger than the sum of its proper divisors (508973543).

1215523225 is a wasteful number, since it uses less digits than its factorization.

1215523225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7785 (or 7780 counting only the distinct ones).

The product of its digits is 6000, while the sum is 28.

The square root of 1215523225 is about 34864.3546476914. The cubic root of 1215523225 is about 1067.2211426570.

Adding to 1215523225 its reverse (5223255121), we get a palindrome (6438778346).

The spelling of 1215523225 in words is "one billion, two hundred fifteen million, five hundred twenty-three thousand, two hundred twenty-five".