4431121020091 has 2 divisors, whose sum is σ = 4431121020092. Its totient is φ = 4431121020090.

The previous prime is 4431121020083. The next prime is 4431121020113. The reversal of 4431121020091 is 1900201211344.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4431121020091 - 2³ = 4431121020083 is a prime.

It is not a weakly prime, because it can be changed into another prime (4431121020031) 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, 2215560510045 + 2215560510046.

It is an arithmetic number, because the mean of its divisors is an integer number (2215560510046).

Almost surely, 2^{4431121020091} is an apocalyptic number.

4431121020091 is a deficient number, since it is larger than the sum of its proper divisors (1).

4431121020091 is an equidigital number, since it uses as much as digits as its factorization.

4431121020091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 4431121020091 in words is "four trillion, four hundred thirty-one billion, one hundred twenty-one million, twenty thousand, ninety-one".