42666931 has 2 divisors, whose sum is σ = 42666932. Its totient is φ = 42666930.

The previous prime is 42666907. The next prime is 42666947. The reversal of 42666931 is 13966624.

It is a happy number.

42666931 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 a de Polignac number, because none of the positive numbers 2^k-42666931 is a prime.

It is a super-2 number, since 2×42666931² = 3640934001917522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42666901) 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, 21333465 + 21333466.

It is an arithmetic number, because the mean of its divisors is an integer number (21333466).

Almost surely, 2^42666931 is an apocalyptic number.

42666931 is a deficient number, since it is larger than the sum of its proper divisors (1).

42666931 is an equidigital number, since it uses as much as digits as its factorization.

42666931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 37.

The square root of 42666931 is about 6531.9928811964. The cubic root of 42666931 is about 349.4329075069.

The spelling of 42666931 in words is "forty-two million, six hundred sixty-six thousand, nine hundred thirty-one".