13838891491 has 2 divisors, whose sum is σ = 13838891492. Its totient is φ = 13838891490.

The previous prime is 13838891467. The next prime is 13838891501. The reversal of 13838891491 is 19419883831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13838891491 - 2¹⁹ = 13838367203 is a prime.

It is not a weakly prime, because it can be changed into another prime (13838891461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6919445745 + 6919445746.

It is an arithmetic number, because the mean of its divisors is an integer number (6919445746).

Almost surely, 2^13838891491 is an apocalyptic number.

13838891491 is a deficient number, since it is larger than the sum of its proper divisors (1).

13838891491 is an equidigital number, since it uses as much as digits as its factorization.

13838891491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 55.

The spelling of 13838891491 in words is "thirteen billion, eight hundred thirty-eight million, eight hundred ninety-one thousand, four hundred ninety-one".