42905791 has 2 divisors, whose sum is σ = 42905792. Its totient is φ = 42905790.

The previous prime is 42905789. The next prime is 42905801. The reversal of 42905791 is 19750924.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42905791 - 2¹ = 42905789 is a prime.

Together with 42905789, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 42905791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42905491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21452895 + 21452896.

It is an arithmetic number, because the mean of its divisors is an integer number (21452896).

Almost surely, 2^42905791 is an apocalyptic number.

42905791 is a deficient number, since it is larger than the sum of its proper divisors (1).

42905791 is an equidigital number, since it uses as much as digits as its factorization.

42905791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 42905791 is about 6550.2512165565. The cubic root of 42905791 is about 350.0837649851.

The spelling of 42905791 in words is "forty-two million, nine hundred five thousand, seven hundred ninety-one".