13128971 has 2 divisors, whose sum is σ = 13128972. Its totient is φ = 13128970.

The previous prime is 13128949. The next prime is 13128991. The reversal of 13128971 is 17982131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13128971 - 2¹⁴ = 13112587 is a prime.

It is not a weakly prime, because it can be changed into another prime (13128901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6564485 + 6564486.

It is an arithmetic number, because the mean of its divisors is an integer number (6564486).

Almost surely, 2^13128971 is an apocalyptic number.

13128971 is a deficient number, since it is larger than the sum of its proper divisors (1).

13128971 is an equidigital number, since it uses as much as digits as its factorization.

13128971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 32.

The square root of 13128971 is about 3623.3921951674. The cubic root of 13128971 is about 235.9084857762.

The spelling of 13128971 in words is "thirteen million, one hundred twenty-eight thousand, nine hundred seventy-one".