1215125525 has 24 divisors (see below), whose sum is σ = 1593127200. Its totient is φ = 916833600.

The previous prime is 1215125479. The next prime is 1215125537. The reversal of 1215125525 is 5255215121.

It is not a de Polignac number, because 1215125525 - 2¹⁴ = 1215109141 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103190 + ... + 114360.

It is an arithmetic number, because the mean of its divisors is an integer number (66380300).

Almost surely, 2^1215125525 is an apocalyptic number.

It is an amenable number.

1215125525 is a deficient number, since it is larger than the sum of its proper divisors (378001675).

1215125525 is a wasteful number, since it uses less digits than its factorization.

1215125525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11429 (or 11424 counting only the distinct ones).

The product of its digits is 5000, while the sum is 29.

The square root of 1215125525 is about 34858.6506480099. The cubic root of 1215125525 is about 1067.1047373270.

The spelling of 1215125525 in words is "one billion, two hundred fifteen million, one hundred twenty-five thousand, five hundred twenty-five".