217097685 has 96 divisors (see below), whose sum is σ = 461617920. Its totient is φ = 96453504.

The previous prime is 217097663. The next prime is 217097687. The reversal of 217097685 is 586790712.

It is not a de Polignac number, because 217097685 - 2¹³ = 217089493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 217097685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217097687) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 244312 + ... + 245198.

It is an arithmetic number, because the mean of its divisors is an integer number (4808520).

Almost surely, 2^217097685 is an apocalyptic number.

It is an amenable number.

217097685 is an abundant number, since it is smaller than the sum of its proper divisors (244520235).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217097685 is a wasteful number, since it uses less digits than its factorization.

217097685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952 (or 939 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 217097685 is about 14734.2351345430. The cubic root of 217097685 is about 601.0146581475.

The spelling of 217097685 in words is "two hundred seventeen million, ninety-seven thousand, six hundred eighty-five".