1898144273521 has 2 divisors, whose sum is σ = 1898144273522. Its totient is φ = 1898144273520.

The previous prime is 1898144273503. The next prime is 1898144273561. The reversal of 1898144273521 is 1253724418981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1839332688400 + 58811585121 = 1356220^2 + 242511^2 .

It is a cyclic number.

It is not a de Polignac number, because 1898144273521 - 2⁵ = 1898144273489 is a prime.

It is not a weakly prime, because it can be changed into another prime (1898144273561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949072136760 + 949072136761.

It is an arithmetic number, because the mean of its divisors is an integer number (949072136761).

Almost surely, 2^{1898144273521} is an apocalyptic number.

It is an amenable number.

1898144273521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1898144273521 is an equidigital number, since it uses as much as digits as its factorization.

1898144273521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3870720, while the sum is 55.

The spelling of 1898144273521 in words is "one trillion, eight hundred ninety-eight billion, one hundred forty-four million, two hundred seventy-three thousand, five hundred twenty-one".