1871914121789 has 2 divisors, whose sum is σ = 1871914121790. Its totient is φ = 1871914121788.

The previous prime is 1871914121747. The next prime is 1871914121813. The reversal of 1871914121789 is 9871214191781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1504199225764 + 367714896025 = 1226458^2 + 606395^2 .

It is a cyclic number.

It is not a de Polignac number, because 1871914121789 - 2¹⁶ = 1871914056253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1871914181789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 935957060894 + 935957060895.

It is an arithmetic number, because the mean of its divisors is an integer number (935957060895).

Almost surely, 2^{1871914121789} is an apocalyptic number.

It is an amenable number.

1871914121789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1871914121789 is an equidigital number, since it uses as much as digits as its factorization.

1871914121789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 59.

The spelling of 1871914121789 in words is "one trillion, eight hundred seventy-one billion, nine hundred fourteen million, one hundred twenty-one thousand, seven hundred eighty-nine".