217285147 has 2 divisors, whose sum is σ = 217285148. Its totient is φ = 217285146.

The previous prime is 217285129. The next prime is 217285207. The reversal of 217285147 is 741582712.

217285147 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 217285147 - 2²⁷ = 83067419 is a prime.

It is not a weakly prime, because it can be changed into another prime (217285447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108642573 + 108642574.

It is an arithmetic number, because the mean of its divisors is an integer number (108642574).

Almost surely, 2^217285147 is an apocalyptic number.

217285147 is a deficient number, since it is larger than the sum of its proper divisors (1).

217285147 is an equidigital number, since it uses as much as digits as its factorization.

217285147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31360, while the sum is 37.

The square root of 217285147 is about 14740.5952050791. The cubic root of 217285147 is about 601.1875987238.

The spelling of 217285147 in words is "two hundred seventeen million, two hundred eighty-five thousand, one hundred forty-seven".