42643291 has 2 divisors, whose sum is σ = 42643292. Its totient is φ = 42643290.

The previous prime is 42643267. The next prime is 42643301. The reversal of 42643291 is 19234624.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42643291 - 2⁹ = 42642779 is a prime.

It is not a weakly prime, because it can be changed into another prime (42643591) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21321645 + 21321646.

It is an arithmetic number, because the mean of its divisors is an integer number (21321646).

Almost surely, 2^42643291 is an apocalyptic number.

42643291 is a deficient number, since it is larger than the sum of its proper divisors (1).

42643291 is an equidigital number, since it uses as much as digits as its factorization.

42643291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 31.

The square root of 42643291 is about 6530.1830755347. The cubic root of 42643291 is about 349.3683600941.

The spelling of 42643291 in words is "forty-two million, six hundred forty-three thousand, two hundred ninety-one".