42309791 has 2 divisors, whose sum is σ = 42309792. Its totient is φ = 42309790.

The previous prime is 42309781. The next prime is 42309797. The reversal of 42309791 is 19790324.

42309791 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 42309791 - 2⁶ = 42309727 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 (42309797) 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, 21154895 + 21154896.

It is an arithmetic number, because the mean of its divisors is an integer number (21154896).

Almost surely, 2^42309791 is an apocalyptic number.

42309791 is a deficient number, since it is larger than the sum of its proper divisors (1).

42309791 is an equidigital number, since it uses as much as digits as its factorization.

42309791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 42309791 is about 6504.5976816403. The cubic root of 42309791 is about 348.4552081236.

The spelling of 42309791 in words is "forty-two million, three hundred nine thousand, seven hundred ninety-one".