216959697 has 24 divisors (see below), whose sum is σ = 319737600. Its totient is φ = 141725088.

The previous prime is 216959681. The next prime is 216959747. The reversal of 216959697 is 796959612.

It is not a de Polignac number, because 216959697 - 2⁴ = 216959681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216959497) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 253923 + ... + 254775.

It is an arithmetic number, because the mean of its divisors is an integer number (13322400).

Almost surely, 2^216959697 is an apocalyptic number.

It is an amenable number.

216959697 is a deficient number, since it is larger than the sum of its proper divisors (102777903).

216959697 is a wasteful number, since it uses less digits than its factorization.

216959697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397 (or 1394 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 54.

The square root of 216959697 is about 14729.5518261758. The cubic root of 216959697 is about 600.8872955309.

The spelling of 216959697 in words is "two hundred sixteen million, nine hundred fifty-nine thousand, six hundred ninety-seven".