42819851 has 2 divisors, whose sum is σ = 42819852. Its totient is φ = 42819850.

The previous prime is 42819827. The next prime is 42819853. The reversal of 42819851 is 15891824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42819851 - 2¹⁰ = 42818827 is a prime.

Together with 42819853, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42819853) 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, 21409925 + 21409926.

It is an arithmetic number, because the mean of its divisors is an integer number (21409926).

Almost surely, 2^42819851 is an apocalyptic number.

42819851 is a deficient number, since it is larger than the sum of its proper divisors (1).

42819851 is an equidigital number, since it uses as much as digits as its factorization.

42819851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 38.

The square root of 42819851 is about 6543.6878745857. The cubic root of 42819851 is about 349.8498703062.

The spelling of 42819851 in words is "forty-two million, eight hundred nineteen thousand, eight hundred fifty-one".