1215216525 has 24 divisors (see below), whose sum is σ = 2127345984. Its totient is φ = 609990400.

The previous prime is 1215216521. The next prime is 1215216599. The reversal of 1215216525 is 5256125121.

It is not a de Polignac number, because 1215216525 - 2² = 1215216521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1215216492 and 1215216501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215216521) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 475281 + ... + 477830.

It is an arithmetic number, because the mean of its divisors is an integer number (88639416).

Almost surely, 2^1215216525 is an apocalyptic number.

1215216525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1215216525 is a deficient number, since it is larger than the sum of its proper divisors (912129459).

1215216525 is a wasteful number, since it uses less digits than its factorization.

1215216525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953141 (or 953136 counting only the distinct ones).

The product of its digits is 6000, while the sum is 30.

The square root of 1215216525 is about 34859.9558949807. The cubic root of 1215216525 is about 1067.1313749336.

The spelling of 1215216525 in words is "one billion, two hundred fifteen million, two hundred sixteen thousand, five hundred twenty-five".