216860897 has 4 divisors (see below), whose sum is σ = 236575536. Its totient is φ = 197146260.

The previous prime is 216860893. The next prime is 216860921. The reversal of 216860897 is 798068612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216860897 - 2² = 216860893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216860893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9857303 + ... + 9857324.

It is an arithmetic number, because the mean of its divisors is an integer number (59143884).

Almost surely, 2^216860897 is an apocalyptic number.

It is an amenable number.

216860897 is a deficient number, since it is larger than the sum of its proper divisors (19714639).

216860897 is a wasteful number, since it uses less digits than its factorization.

216860897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19714638.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 216860897 is about 14726.1976422972. The cubic root of 216860897 is about 600.7960701719.

The spelling of 216860897 in words is "two hundred sixteen million, eight hundred sixty thousand, eight hundred ninety-seven".