42015851 has 2 divisors, whose sum is σ = 42015852. Its totient is φ = 42015850.

The previous prime is 42015793. The next prime is 42015877. The reversal of 42015851 is 15851024.

It is an a-pointer prime, because the next prime (42015877) can be obtained adding 42015851 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42015851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42015851.

It is not a weakly prime, because it can be changed into another prime (42015151) 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, 21007925 + 21007926.

It is an arithmetic number, because the mean of its divisors is an integer number (21007926).

Almost surely, 2^42015851 is an apocalyptic number.

42015851 is a deficient number, since it is larger than the sum of its proper divisors (1).

42015851 is an equidigital number, since it uses as much as digits as its factorization.

42015851 is an odious number, because the sum of its binary digits is odd.

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

The square root of 42015851 is about 6481.9635142447. The cubic root of 42015851 is about 347.6463879556.

Adding to 42015851 its reverse (15851024), we get a palindrome (57866875).

The spelling of 42015851 in words is "forty-two million, fifteen thousand, eight hundred fifty-one".