42215291 has 2 divisors, whose sum is σ = 42215292. Its totient is φ = 42215290.

The previous prime is 42215269. The next prime is 42215297. The reversal of 42215291 is 19251224.

42215291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42215291 - 2¹⁰ = 42214267 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42215291.

It is not a weakly prime, because it can be changed into another prime (42215297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21107645 + 21107646.

It is an arithmetic number, because the mean of its divisors is an integer number (21107646).

Almost surely, 2^42215291 is an apocalyptic number.

42215291 is a deficient number, since it is larger than the sum of its proper divisors (1).

42215291 is an equidigital number, since it uses as much as digits as its factorization.

42215291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 26.

The square root of 42215291 is about 6497.3295283524. The cubic root of 42215291 is about 348.1955868650.

The spelling of 42215291 in words is "forty-two million, two hundred fifteen thousand, two hundred ninety-one".