42891811 has 2 divisors, whose sum is σ = 42891812. Its totient is φ = 42891810.

The previous prime is 42891791. The next prime is 42891829. The reversal of 42891811 is 11819824.

42891811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42891811 - 2¹⁵ = 42859043 is a prime.

It is not a weakly prime, because it can be changed into another prime (42898811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21445905 + 21445906.

It is an arithmetic number, because the mean of its divisors is an integer number (21445906).

Almost surely, 2^42891811 is an apocalyptic number.

42891811 is a deficient number, since it is larger than the sum of its proper divisors (1).

42891811 is an equidigital number, since it uses as much as digits as its factorization.

42891811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 34.

The square root of 42891811 is about 6549.1839949722. The cubic root of 42891811 is about 350.0457382403.

The spelling of 42891811 in words is "forty-two million, eight hundred ninety-one thousand, eight hundred eleven".