215208871 has 2 divisors, whose sum is σ = 215208872. Its totient is φ = 215208870.

The previous prime is 215208869. The next prime is 215208943. The reversal of 215208871 is 178802512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215208871 - 2¹ = 215208869 is a prime.

It is a super-4 number, since 4×215208871⁴ (a number of 34 digits) contains 4444 as substring.

Together with 215208869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215208821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107604435 + 107604436.

It is an arithmetic number, because the mean of its divisors is an integer number (107604436).

Almost surely, 2^215208871 is an apocalyptic number.

215208871 is a deficient number, since it is larger than the sum of its proper divisors (1).

215208871 is an equidigital number, since it uses as much as digits as its factorization.

215208871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 215208871 is about 14669.9990115882. Note that the first 3 decimals coincide. The cubic root of 215208871 is about 599.2665769979.

The spelling of 215208871 in words is "two hundred fifteen million, two hundred eight thousand, eight hundred seventy-one".