217025345 has 16 divisors (see below), whose sum is σ = 265171968. Its totient is φ = 170479680.

The previous prime is 217025311. The next prime is 217025359. The reversal of 217025345 is 543520712.

It is a happy number.

It is not a de Polignac number, because 217025345 - 2¹⁰ = 217024321 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97232 + ... + 99438.

It is an arithmetic number, because the mean of its divisors is an integer number (16573248).

Almost surely, 2^217025345 is an apocalyptic number.

It is an amenable number.

217025345 is a deficient number, since it is larger than the sum of its proper divisors (48146623).

217025345 is a wasteful number, since it uses less digits than its factorization.

217025345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 217025345 is about 14731.7801028932. The cubic root of 217025345 is about 600.9478952210.

The spelling of 217025345 in words is "two hundred seventeen million, twenty-five thousand, three hundred forty-five".