13138891 has 2 divisors, whose sum is σ = 13138892. Its totient is φ = 13138890.

The previous prime is 13138889. The next prime is 13138919. The reversal of 13138891 is 19883131.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19883131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13138891 - 2¹ = 13138889 is a prime.

Together with 13138889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13138591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6569445 + 6569446.

It is an arithmetic number, because the mean of its divisors is an integer number (6569446).

Almost surely, 2^13138891 is an apocalyptic number.

13138891 is the 2293-rd centered pentagonal number.

13138891 is a deficient number, since it is larger than the sum of its proper divisors (1).

13138891 is an equidigital number, since it uses as much as digits as its factorization.

13138891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 34.

The square root of 13138891 is about 3624.7608196956. The cubic root of 13138891 is about 235.9678868016.

The spelling of 13138891 in words is "thirteen million, one hundred thirty-eight thousand, eight hundred ninety-one".