13215111849 has 45 divisors (see below), whose sum is σ = 20204428629. Its totient is φ = 8607980160.

The previous prime is 13215111839. The next prime is 13215111853. The reversal of 13215111849 is 94811151231.

The square root of 13215111849 is 114957.

It is a perfect power (a square), and thus also a powerful number.

13215111849 is a `hidden beast` number, since 132 + 1 + 511 + 1 + 8 + 4 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2959904025 + 10255207824 = 54405^2 + 101268^2 .

It is not a de Polignac number, because 13215111849 - 2¹⁷ = 13214980777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13215111809) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 54834369 + ... + 54834609.

Almost surely, 2^13215111849 is an apocalyptic number.

13215111849 is the 114957-th square number.

13215111849 is the 57479-th centered octagonal number.

It is an amenable number.

13215111849 is a deficient number, since it is larger than the sum of its proper divisors (6989316780).

13215111849 is an frugal number, since it uses more digits than its factorization.

13215111849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600 (or 297 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

Multiplying 13215111849 by its sum of digits (36), we get a square (475744026564 = 689742²).

The spelling of 13215111849 in words is "thirteen billion, two hundred fifteen million, one hundred eleven thousand, eight hundred forty-nine".