217230953 has 2 divisors, whose sum is σ = 217230954. Its totient is φ = 217230952.

The previous prime is 217230889. The next prime is 217230973. The reversal of 217230953 is 359032712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216913984 + 316969 = 14728^2 + 563^2 .

It is a cyclic number.

It is not a de Polignac number, because 217230953 - 2⁶ = 217230889 is a prime.

It is not a weakly prime, because it can be changed into another prime (217230973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108615476 + 108615477.

It is an arithmetic number, because the mean of its divisors is an integer number (108615477).

Almost surely, 2^217230953 is an apocalyptic number.

It is an amenable number.

217230953 is a deficient number, since it is larger than the sum of its proper divisors (1).

217230953 is an equidigital number, since it uses as much as digits as its factorization.

217230953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 217230953 is about 14738.7568336003. The cubic root of 217230953 is about 601.1376129942.

The spelling of 217230953 in words is "two hundred seventeen million, two hundred thirty thousand, nine hundred fifty-three".