13128431 has 2 divisors, whose sum is σ = 13128432. Its totient is φ = 13128430.

The previous prime is 13128419. The next prime is 13128433. The reversal of 13128431 is 13482131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13128431 - 2¹⁰ = 13127407 is a prime.

It is a super-2 number, since 2×13128431² = 344711401043522, which contains 22 as substring.

Together with 13128433, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 13128397 and 13128406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13128433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6564215 + 6564216.

It is an arithmetic number, because the mean of its divisors is an integer number (6564216).

Almost surely, 2^13128431 is an apocalyptic number.

13128431 is a deficient number, since it is larger than the sum of its proper divisors (1).

13128431 is an equidigital number, since it uses as much as digits as its factorization.

13128431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 23.

The square root of 13128431 is about 3623.3176785924. The cubic root of 13128431 is about 235.9052513940.

The spelling of 13128431 in words is "thirteen million, one hundred twenty-eight thousand, four hundred thirty-one".