1898419191121 has 2 divisors, whose sum is σ = 1898419191122. Its totient is φ = 1898419191120.

The previous prime is 1898419191107. The next prime is 1898419191217. The reversal of 1898419191121 is 1211919148981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1444897757521 + 453521433600 = 1202039^2 + 673440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1898419191121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1898419195121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949209595560 + 949209595561.

It is an arithmetic number, because the mean of its divisors is an integer number (949209595561).

Almost surely, 2^{1898419191121} is an apocalyptic number.

It is an amenable number.

1898419191121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1898419191121 is an equidigital number, since it uses as much as digits as its factorization.

1898419191121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 55.

The spelling of 1898419191121 in words is "one trillion, eight hundred ninety-eight billion, four hundred nineteen million, one hundred ninety-one thousand, one hundred twenty-one".