13129771 has 4 divisors (see below), whose sum is σ = 13553344. Its totient is φ = 12706200.

The previous prime is 13129769. The next prime is 13129793. The reversal of 13129771 is 17792131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17792131 = 7 ⋅2541733.

It is a cyclic number.

It is not a de Polignac number, because 13129771 - 2¹ = 13129769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 423541 = 13129771 / (1 + 3 + 1 + 2 + 9 + 7 + 7 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13129751) 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, 211740 + ... + 211801.

It is an arithmetic number, because the mean of its divisors is an integer number (3388336).

Almost surely, 2^13129771 is an apocalyptic number.

13129771 is a deficient number, since it is larger than the sum of its proper divisors (423573).

13129771 is an equidigital number, since it uses as much as digits as its factorization.

13129771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423572.

The product of its digits is 2646, while the sum is 31.

The square root of 13129771 is about 3623.5025872766. The cubic root of 13129771 is about 235.9132772904.

The spelling of 13129771 in words is "thirteen million, one hundred twenty-nine thousand, seven hundred seventy-one".