1215643316 has 12 divisors (see below), whose sum is σ = 2163433440. Its totient is φ = 597519480.

The previous prime is 1215643309. The next prime is 1215643343. The reversal of 1215643316 is 6133465121.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2575280 + ... + 2575751.

It is an arithmetic number, because the mean of its divisors is an integer number (180286120).

Almost surely, 2^1215643316 is an apocalyptic number.

It is an amenable number.

1215643316 is a deficient number, since it is larger than the sum of its proper divisors (947790124).

1215643316 is a wasteful number, since it uses less digits than its factorization.

1215643316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5151094 (or 5151092 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 1215643316 is about 34866.0768656297. The cubic root of 1215643316 is about 1067.2562878606.

The spelling of 1215643316 in words is "one billion, two hundred fifteen million, six hundred forty-three thousand, three hundred sixteen".