217292947 has 2 divisors, whose sum is σ = 217292948. Its totient is φ = 217292946.

The previous prime is 217292909. The next prime is 217292953. The reversal of 217292947 is 749292712.

217292947 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 217292947 - 2⁷ = 217292819 is a prime.

It is not a weakly prime, because it can be changed into another prime (217272947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108646473 + 108646474.

It is an arithmetic number, because the mean of its divisors is an integer number (108646474).

Almost surely, 2^217292947 is an apocalyptic number.

217292947 is a deficient number, since it is larger than the sum of its proper divisors (1).

217292947 is an equidigital number, since it uses as much as digits as its factorization.

217292947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 43.

The square root of 217292947 is about 14740.8597781812. The cubic root of 217292947 is about 601.1947923543.

The spelling of 217292947 in words is "two hundred seventeen million, two hundred ninety-two thousand, nine hundred forty-seven".