1215500525 has 24 divisors (see below), whose sum is σ = 1521569280. Its totient is φ = 963195840.

The previous prime is 1215500521. The next prime is 1215500537. The reversal of 1215500525 is 5250055121.

It is not a de Polignac number, because 1215500525 - 2² = 1215500521 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1215500494 and 1215500503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215500521) 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, 1465811 + ... + 1466639.

It is an arithmetic number, because the mean of its divisors is an integer number (63398720).

Almost surely, 2^1215500525 is an apocalyptic number.

It is an amenable number.

1215500525 is a deficient number, since it is larger than the sum of its proper divisors (306068755).

1215500525 is a wasteful number, since it uses less digits than its factorization.

With its successor (1215500526) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1320).

With its successor (1215500526) it forms an eRAP, since the sums of their prime factors are consecutive (1325 and 1326).

1215500525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325 (or 1320 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 1215500525 is about 34864.0290987717. The cubic root of 1215500525 is about 1067.2144991337.

Adding to 1215500525 its reverse (5250055121), we get a palindrome (6465555646).

The spelling of 1215500525 in words is "one billion, two hundred fifteen million, five hundred thousand, five hundred twenty-five".