42307691 has 2 divisors, whose sum is σ = 42307692. Its totient is φ = 42307690.

The previous prime is 42307609. The next prime is 42307697. The reversal of 42307691 is 19670324.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42307691 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (42307697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21153845 + 21153846.

It is an arithmetic number, because the mean of its divisors is an integer number (21153846).

Almost surely, 2^42307691 is an apocalyptic number.

42307691 is a deficient number, since it is larger than the sum of its proper divisors (1).

42307691 is an equidigital number, since it uses as much as digits as its factorization.

42307691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 42307691 is about 6504.4362553568. The cubic root of 42307691 is about 348.4494429644.

The spelling of 42307691 in words is "forty-two million, three hundred seven thousand, six hundred ninety-one".