1891713753887 has 2 divisors, whose sum is σ = 1891713753888. Its totient is φ = 1891713753886.

The previous prime is 1891713753857. The next prime is 1891713753893. The reversal of 1891713753887 is 7883573171981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1891713753887 - 2²⁶ = 1891646645023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1891713753857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945856876943 + 945856876944.

It is an arithmetic number, because the mean of its divisors is an integer number (945856876944).

Almost surely, 2^{1891713753887} is an apocalyptic number.

1891713753887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1891713753887 is an equidigital number, since it uses as much as digits as its factorization.

1891713753887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71124480, while the sum is 68.

The spelling of 1891713753887 in words is "one trillion, eight hundred ninety-one billion, seven hundred thirteen million, seven hundred fifty-three thousand, eight hundred eighty-seven".