42912791 has 2 divisors, whose sum is σ = 42912792. Its totient is φ = 42912790.

The previous prime is 42912769. The next prime is 42912809. The reversal of 42912791 is 19721924.

42912791 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 42912791 - 2²² = 38718487 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42912391) 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, 21456395 + 21456396.

It is an arithmetic number, because the mean of its divisors is an integer number (21456396).

Almost surely, 2^42912791 is an apocalyptic number.

42912791 is a deficient number, since it is larger than the sum of its proper divisors (1).

42912791 is an equidigital number, since it uses as much as digits as its factorization.

42912791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 35.

The square root of 42912791 is about 6550.7855254160. The cubic root of 42912791 is about 350.1028024548.

The spelling of 42912791 in words is "forty-two million, nine hundred twelve thousand, seven hundred ninety-one".