42009311 has 2 divisors, whose sum is σ = 42009312. Its totient is φ = 42009310.

The previous prime is 42009307. The next prime is 42009343. The reversal of 42009311 is 11390024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42009311 - 2² = 42009307 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42009391) 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, 21004655 + 21004656.

It is an arithmetic number, because the mean of its divisors is an integer number (21004656).

Almost surely, 2^42009311 is an apocalyptic number.

42009311 is a deficient number, since it is larger than the sum of its proper divisors (1).

42009311 is an equidigital number, since it uses as much as digits as its factorization.

42009311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 42009311 is about 6481.4590178447. The cubic root of 42009311 is about 347.6283493241.

Adding to 42009311 its reverse (11390024), we get a palindrome (53399335).

The spelling of 42009311 in words is "forty-two million, nine thousand, three hundred eleven".