1748440911821 has 2 divisors, whose sum is σ = 1748440911822. Its totient is φ = 1748440911820.

The previous prime is 1748440911793. The next prime is 1748440911827. The reversal of 1748440911821 is 1281190448471.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1748437621225 + 3290596 = 1322285^2 + 1814^2 .

It is a cyclic number.

It is not a de Polignac number, because 1748440911821 - 2⁶ = 1748440911757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1748440911821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1748440911827) 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, 874220455910 + 874220455911.

It is an arithmetic number, because the mean of its divisors is an integer number (874220455911).

Almost surely, 2^{1748440911821} is an apocalyptic number.

It is an amenable number.

1748440911821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1748440911821 is an equidigital number, since it uses as much as digits as its factorization.

1748440911821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 516096, while the sum is 50.

The spelling of 1748440911821 in words is "one trillion, seven hundred forty-eight billion, four hundred forty million, nine hundred eleven thousand, eight hundred twenty-one".