1388493853991 has 2 divisors, whose sum is σ = 1388493853992. Its totient is φ = 1388493853990.

The previous prime is 1388493853973. The next prime is 1388493854017. The reversal of 1388493853991 is 1993583948831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1388493853991 - 2²⁶ = 1388426745127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1388493853921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694246926995 + 694246926996.

It is an arithmetic number, because the mean of its divisors is an integer number (694246926996).

Almost surely, 2^{1388493853991} is an apocalyptic number.

1388493853991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388493853991 is an equidigital number, since it uses as much as digits as its factorization.

1388493853991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201553920, while the sum is 71.

The spelling of 1388493853991 in words is "one trillion, three hundred eighty-eight billion, four hundred ninety-three million, eight hundred fifty-three thousand, nine hundred ninety-one".