1215989841 has 16 divisors (see below), whose sum is σ = 1776063168. Its totient is φ = 733900800.

The previous prime is 1215989833. The next prime is 1215989843. The reversal of 1215989841 is 1489895121.

It is a happy number.

It is not a de Polignac number, because 1215989841 - 2³ = 1215989833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215989843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68496 + ... + 84401.

It is an arithmetic number, because the mean of its divisors is an integer number (111003948).

Almost surely, 2^1215989841 is an apocalyptic number.

1215989841 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1215989841 is a deficient number, since it is larger than the sum of its proper divisors (560073327).

1215989841 is a wasteful number, since it uses less digits than its factorization.

1215989841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153152.

The product of its digits is 207360, while the sum is 48.

The square root of 1215989841 is about 34871.0458833686. The cubic root of 1215989841 is about 1067.3576870800.

The spelling of 1215989841 in words is "one billion, two hundred fifteen million, nine hundred eighty-nine thousand, eight hundred forty-one".