42170851 has 2 divisors, whose sum is σ = 42170852. Its totient is φ = 42170850.

The previous prime is 42170839. The next prime is 42170867. The reversal of 42170851 is 15807124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42170851 - 2¹¹ = 42168803 is a prime.

It is not a weakly prime, because it can be changed into another prime (42170551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21085425 + 21085426.

It is an arithmetic number, because the mean of its divisors is an integer number (21085426).

Almost surely, 2^42170851 is an apocalyptic number.

42170851 is a deficient number, since it is larger than the sum of its proper divisors (1).

42170851 is an equidigital number, since it uses as much as digits as its factorization.

42170851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 42170851 is about 6493.9087612932. The cubic root of 42170851 is about 348.0733622363.

Adding to 42170851 its reverse (15807124), we get a palindrome (57977975).

The spelling of 42170851 in words is "forty-two million, one hundred seventy thousand, eight hundred fifty-one".