1215564316 has 12 divisors (see below), whose sum is σ = 2132708760. Its totient is φ = 606218960.

The previous prime is 1215564271. The next prime is 1215564323. The reversal of 1215564316 is 6134655121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389050 + ... + 392161.

It is an arithmetic number, because the mean of its divisors is an integer number (177725730).

Almost surely, 2^1215564316 is an apocalyptic number.

It is an amenable number.

1215564316 is a deficient number, since it is larger than the sum of its proper divisors (917144444).

1215564316 is a wasteful number, since it uses less digits than its factorization.

1215564316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781604 (or 781602 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 1215564316 is about 34864.9439408699. The cubic root of 1215564316 is about 1067.2331683945.

The spelling of 1215564316 in words is "one billion, two hundred fifteen million, five hundred sixty-four thousand, three hundred sixteen".