13549397329 has 4 divisors (see below), whose sum is σ = 14591658676. Its totient is φ = 12507135984.

The previous prime is 13549397327. The next prime is 13549397339. The reversal of 13549397329 is 92379394531.

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 565250625 + 12984146704 = 23775^2 + 113948^2 .

It is a cyclic number.

It is not a de Polignac number, because 13549397329 - 2¹ = 13549397327 is a prime.

It is a super-2 number, since 2×13549397329² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13549397329.

It is not an unprimeable number, because it can be changed into a prime (13549397327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521130654 + ... + 521130679.

It is an arithmetic number, because the mean of its divisors is an integer number (3647914669).

Almost surely, 2^13549397329 is an apocalyptic number.

It is an amenable number.

13549397329 is a deficient number, since it is larger than the sum of its proper divisors (1042261347).

13549397329 is a wasteful number, since it uses less digits than its factorization.

13549397329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042261346.

The product of its digits is 5511240, while the sum is 55.

The spelling of 13549397329 in words is "thirteen billion, five hundred forty-nine million, three hundred ninety-seven thousand, three hundred twenty-nine".