13491889 has 2 divisors, whose sum is σ = 13491890. Its totient is φ = 13491888.

The previous prime is 13491887. The next prime is 13491893. The reversal of 13491889 is 98819431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11971600 + 1520289 = 3460^2 + 1233^2 .

It is a cyclic number.

It is not a de Polignac number, because 13491889 - 2¹ = 13491887 is a prime.

Together with 13491887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13491887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6745944 + 6745945.

It is an arithmetic number, because the mean of its divisors is an integer number (6745945).

Almost surely, 2^13491889 is an apocalyptic number.

It is an amenable number.

13491889 is a deficient number, since it is larger than the sum of its proper divisors (1).

13491889 is an equidigital number, since it uses as much as digits as its factorization.

13491889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 43.

The square root of 13491889 is about 3673.1306810404. The cubic root of 13491889 is about 238.0624615383.

The spelling of 13491889 in words is "thirteen million, four hundred ninety-one thousand, eight hundred eighty-nine".