1928201838091 has 2 divisors, whose sum is σ = 1928201838092. Its totient is φ = 1928201838090.

The previous prime is 1928201838089. The next prime is 1928201838113. The reversal of 1928201838091 is 1908381028291.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1928201838091 - 2¹ = 1928201838089 is a prime.

Together with 1928201838089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1928201838001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 964100919045 + 964100919046.

It is an arithmetic number, because the mean of its divisors is an integer number (964100919046).

Almost surely, 2^{1928201838091} is an apocalyptic number.

1928201838091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1928201838091 is an equidigital number, since it uses as much as digits as its factorization.

1928201838091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 52.

The spelling of 1928201838091 in words is "one trillion, nine hundred twenty-eight billion, two hundred one million, eight hundred thirty-eight thousand, ninety-one".