1938688894841 has 2 divisors, whose sum is σ = 1938688894842. Its totient is φ = 1938688894840.

The previous prime is 1938688894823. The next prime is 1938688894867. The reversal of 1938688894841 is 1484988868391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1352092212025 + 586596682816 = 1162795^2 + 765896^2 .

It is a cyclic number.

It is not a de Polignac number, because 1938688894841 - 2⁶ = 1938688894777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1938684894841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969344447420 + 969344447421.

It is an arithmetic number, because the mean of its divisors is an integer number (969344447421).

Almost surely, 2^{1938688894841} is an apocalyptic number.

It is an amenable number.

1938688894841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938688894841 is an equidigital number, since it uses as much as digits as its factorization.

1938688894841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 764411904, while the sum is 77.

The spelling of 1938688894841 in words is "one trillion, nine hundred thirty-eight billion, six hundred eighty-eight million, eight hundred ninety-four thousand, eight hundred forty-one".