217230425 has 6 divisors (see below), whose sum is σ = 269365758. Its totient is φ = 173784320.

The previous prime is 217230383. The next prime is 217230443. The reversal of 217230425 is 524032712.

It can be written as a sum of positive squares in 3 ways, for example, as 47293129 + 169937296 = 6877^2 + 13036^2 .

It is a de Polignac number, because none of the positive numbers 2^k-217230425 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217230394 and 217230403.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4344584 + ... + 4344633.

It is an arithmetic number, because the mean of its divisors is an integer number (44894293).

Almost surely, 2^217230425 is an apocalyptic number.

217230425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

217230425 is a deficient number, since it is larger than the sum of its proper divisors (52135333).

217230425 is an equidigital number, since it uses as much as digits as its factorization.

217230425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8689227 (or 8689222 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 217230425 is about 14738.7389216310. The cubic root of 217230425 is about 601.1371259536.

The spelling of 217230425 in words is "two hundred seventeen million, two hundred thirty thousand, four hundred twenty-five".