215252171 has 2 divisors, whose sum is σ = 215252172. Its totient is φ = 215252170.

The previous prime is 215252143. The next prime is 215252183. The reversal of 215252171 is 171252512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215252171 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215252171.

It is not a weakly prime, because it can be changed into another prime (215252971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107626085 + 107626086.

It is an arithmetic number, because the mean of its divisors is an integer number (107626086).

Almost surely, 2^215252171 is an apocalyptic number.

215252171 is a deficient number, since it is larger than the sum of its proper divisors (1).

215252171 is an equidigital number, since it uses as much as digits as its factorization.

215252171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1400, while the sum is 26.

The square root of 215252171 is about 14671.4747384167. The cubic root of 215252171 is about 599.3067650915.

The spelling of 215252171 in words is "two hundred fifteen million, two hundred fifty-two thousand, one hundred seventy-one".