13605837149 has 4 divisors (see below), whose sum is σ = 13621281660. Its totient is φ = 13590392640.

The previous prime is 13605837109. The next prime is 13605837169. The reversal of 13605837149 is 94173850631.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1102572025 + 12503265124 = 33205^2 + 111818^2 .

It is a cyclic number.

It is not a de Polignac number, because 13605837149 - 2²⁴ = 13589059933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13605837109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7720934 + ... + 7722695.

It is an arithmetic number, because the mean of its divisors is an integer number (3405320415).

Almost surely, 2^13605837149 is an apocalyptic number.

It is an amenable number.

13605837149 is a deficient number, since it is larger than the sum of its proper divisors (15444511).

13605837149 is an equidigital number, since it uses as much as digits as its factorization.

13605837149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15444510.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 13605837149 in words is "thirteen billion, six hundred five million, eight hundred thirty-seven thousand, one hundred forty-nine".