1843555537921 has 2 divisors, whose sum is σ = 1843555537922. Its totient is φ = 1843555537920.

The previous prime is 1843555537867. The next prime is 1843555537927. The reversal of 1843555537921 is 1297355553481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 956266896321 + 887288641600 = 977889^2 + 941960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1843555537921 - 2¹¹ = 1843555535873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1843555537927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 921777768960 + 921777768961.

It is an arithmetic number, because the mean of its divisors is an integer number (921777768961).

Almost surely, 2^{1843555537921} is an apocalyptic number.

It is an amenable number.

1843555537921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1843555537921 is an equidigital number, since it uses as much as digits as its factorization.

1843555537921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680000, while the sum is 58.

The spelling of 1843555537921 in words is "one trillion, eight hundred forty-three billion, five hundred fifty-five million, five hundred thirty-seven thousand, nine hundred twenty-one".