1215541875 has 20 divisors (see below), whose sum is σ = 2025257960. Its totient is φ = 648288000.

The previous prime is 1215541849. The next prime is 1215541897. The reversal of 1215541875 is 5781455121.

It is not a de Polignac number, because 1215541875 - 2¹² = 1215537779 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 322270 + ... + 326019.

It is an arithmetic number, because the mean of its divisors is an integer number (101262898).

Almost surely, 2^1215541875 is an apocalyptic number.

1215541875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1215541875 is a deficient number, since it is larger than the sum of its proper divisors (809716085).

1215541875 is an frugal number, since it uses more digits than its factorization.

1215541875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648312 (or 648297 counting only the distinct ones).

The product of its digits is 56000, while the sum is 39.

The square root of 1215541875 is about 34864.6221118199. The cubic root of 1215541875 is about 1067.2266008202.

Adding to 1215541875 its reverse (5781455121), we get a palindrome (6996996996).

The spelling of 1215541875 in words is "one billion, two hundred fifteen million, five hundred forty-one thousand, eight hundred seventy-five".