42105851 has 2 divisors, whose sum is σ = 42105852. Its totient is φ = 42105850.

The previous prime is 42105841. The next prime is 42105863. The reversal of 42105851 is 15850124.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42105851 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42105851.

It is not a weakly prime, because it can be changed into another prime (42105841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21052925 + 21052926.

It is an arithmetic number, because the mean of its divisors is an integer number (21052926).

Almost surely, 2^42105851 is an apocalyptic number.

42105851 is a deficient number, since it is larger than the sum of its proper divisors (1).

42105851 is an equidigital number, since it uses as much as digits as its factorization.

42105851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 42105851 is about 6488.9021413487. The cubic root of 42105851 is about 347.8944360966.

Adding to 42105851 its reverse (15850124), we get a palindrome (57955975).

The spelling of 42105851 in words is "forty-two million, one hundred five thousand, eight hundred fifty-one".