42168331 has 2 divisors, whose sum is σ = 42168332. Its totient is φ = 42168330.

The previous prime is 42168317. The next prime is 42168367. The reversal of 42168331 is 13386124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42168331 - 2⁹ = 42167819 is a prime.

It is a super-2 number, since 2×42168331² = 3556336278651122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42168331.

It is not a weakly prime, because it can be changed into another prime (42118331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21084165 + 21084166.

It is an arithmetic number, because the mean of its divisors is an integer number (21084166).

Almost surely, 2^42168331 is an apocalyptic number.

42168331 is a deficient number, since it is larger than the sum of its proper divisors (1).

42168331 is an equidigital number, since it uses as much as digits as its factorization.

42168331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 42168331 is about 6493.7147304143. The cubic root of 42168331 is about 348.0664288346.

The spelling of 42168331 in words is "forty-two million, one hundred sixty-eight thousand, three hundred thirty-one".