13091249889 has 15 divisors (see below), whose sum is σ = 19557603043. Its totient is φ = 8726813424.

The previous prime is 13091249887. The next prime is 13091249909. The reversal of 13091249889 is 98894219031.

The square root of 13091249889 is 114417.

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

13091249889 is a `hidden beast` number, since 130 + 9 + 12 + 498 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12404390625 + 686859264 = 111375^2 + 26208^2 .

It is not a de Polignac number, because 13091249889 - 2¹ = 13091249887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13091249881) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1023397 + ... + 1036109.

Almost surely, 2^13091249889 is an apocalyptic number.

13091249889 is the 114417-th square number.

13091249889 is the 57209-th centered octagonal number.

It is an amenable number.

13091249889 is a deficient number, since it is larger than the sum of its proper divisors (6466353154).

13091249889 is an frugal number, since it uses more digits than its factorization.

13091249889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25438 (or 12716 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 13091249889 in words is "thirteen billion, ninety-one million, two hundred forty-nine thousand, eight hundred eighty-nine".