13129547649 has 4 divisors (see below), whose sum is σ = 17506063536. Its totient is φ = 8753031764.

The previous prime is 13129547633. The next prime is 13129547657. The reversal of 13129547649 is 94674592131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13129547649 - 2⁴ = 13129547633 is a prime.

It is a super-2 number, since 2×13129547649² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13169547649) 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, 2188257939 + ... + 2188257944.

It is an arithmetic number, because the mean of its divisors is an integer number (4376515884).

Almost surely, 2^13129547649 is an apocalyptic number.

It is an amenable number.

13129547649 is a deficient number, since it is larger than the sum of its proper divisors (4376515887).

13129547649 is an equidigital number, since it uses as much as digits as its factorization.

13129547649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4376515886.

The product of its digits is 1632960, while the sum is 51.

The spelling of 13129547649 in words is "thirteen billion, one hundred twenty-nine million, five hundred forty-seven thousand, six hundred forty-nine".