42643451 has 2 divisors, whose sum is σ = 42643452. Its totient is φ = 42643450.

The previous prime is 42643421. The next prime is 42643477. The reversal of 42643451 is 15434624.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42643451 is a prime.

It is a Chen prime.

It is equal to p_2584307 and since 42643451 and 2584307 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42643411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21321725 + 21321726.

It is an arithmetic number, because the mean of its divisors is an integer number (21321726).

Almost surely, 2^42643451 is an apocalyptic number.

42643451 is a deficient number, since it is larger than the sum of its proper divisors (1).

42643451 is an equidigital number, since it uses as much as digits as its factorization.

42643451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 29.

The square root of 42643451 is about 6530.1953263283. The cubic root of 42643451 is about 349.3687970434.

The spelling of 42643451 in words is "forty-two million, six hundred forty-three thousand, four hundred fifty-one".