1215203163 has 16 divisors (see below), whose sum is σ = 1716404256. Its totient is φ = 762114560.

The previous prime is 1215203149. The next prime is 1215203179. The reversal of 1215203163 is 3613025121.

It is a cyclic number.

It is not a de Polignac number, because 1215203163 - 2²⁸ = 946767707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215203113) 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, 135445 + ... + 144137.

It is an arithmetic number, because the mean of its divisors is an integer number (107275266).

Almost surely, 2^1215203163 is an apocalyptic number.

1215203163 is a deficient number, since it is larger than the sum of its proper divisors (501201093).

1215203163 is a wasteful number, since it uses less digits than its factorization.

1215203163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11454.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1215203163 is about 34859.7642418878. The cubic root of 1215203163 is about 1067.1274636796.

Adding to 1215203163 its reverse (3613025121), we get a palindrome (4828228284).

The spelling of 1215203163 in words is "one billion, two hundred fifteen million, two hundred three thousand, one hundred sixty-three".