217230973 has 2 divisors, whose sum is σ = 217230974. Its totient is φ = 217230972.

The previous prime is 217230953. The next prime is 217230983. The reversal of 217230973 is 379032712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113252164 + 103978809 = 10642^2 + 10197^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217230973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217230953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108615486 + 108615487.

It is an arithmetic number, because the mean of its divisors is an integer number (108615487).

Almost surely, 2^217230973 is an apocalyptic number.

It is an amenable number.

217230973 is a deficient number, since it is larger than the sum of its proper divisors (1).

217230973 is an equidigital number, since it uses as much as digits as its factorization.

217230973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 217230973 is about 14738.7575120836. The cubic root of 217230973 is about 601.1376314427.

The spelling of 217230973 in words is "two hundred seventeen million, two hundred thirty thousand, nine hundred seventy-three".