4100042109491 has 2 divisors, whose sum is σ = 4100042109492. Its totient is φ = 4100042109490.

The previous prime is 4100042109481. The next prime is 4100042109533. The reversal of 4100042109491 is 1949012400014.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4100042109491 - 2¹⁰ = 4100042108467 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (4100042109481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2050021054745 + 2050021054746.

It is an arithmetic number, because the mean of its divisors is an integer number (2050021054746).

Almost surely, 2^{4100042109491} is an apocalyptic number.

4100042109491 is a deficient number, since it is larger than the sum of its proper divisors (1).

4100042109491 is an equidigital number, since it uses as much as digits as its factorization.

4100042109491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 4100042109491 in words is "four trillion, one hundred billion, forty-two million, one hundred nine thousand, four hundred ninety-one".