215067971 has 2 divisors, whose sum is σ = 215067972. Its totient is φ = 215067970.

The previous prime is 215067959. The next prime is 215067997. The reversal of 215067971 is 179760512.

215067971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215067971 - 2⁶ = 215067907 is a prime.

It is not a weakly prime, because it can be changed into another prime (215067071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107533985 + 107533986.

It is an arithmetic number, because the mean of its divisors is an integer number (107533986).

Almost surely, 2^215067971 is an apocalyptic number.

215067971 is a deficient number, since it is larger than the sum of its proper divisors (1).

215067971 is an equidigital number, since it uses as much as digits as its factorization.

215067971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26460, while the sum is 38.

The square root of 215067971 is about 14665.1959073174. The cubic root of 215067971 is about 599.1357659487.

The spelling of 215067971 in words is "two hundred fifteen million, sixty-seven thousand, nine hundred seventy-one".