216964917 has 24 divisors (see below), whose sum is σ = 338956800. Its totient is φ = 132941088.

The previous prime is 216964903. The next prime is 216964927. The reversal of 216964917 is 719469612.

It is not a de Polignac number, because 216964917 - 2⁷ = 216964789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216964927) 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, 24084 + ... + 31842.

It is an arithmetic number, because the mean of its divisors is an integer number (14123200).

Almost surely, 2^216964917 is an apocalyptic number.

It is an amenable number.

216964917 is a deficient number, since it is larger than the sum of its proper divisors (121991883).

216964917 is a wasteful number, since it uses less digits than its factorization.

216964917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8017 (or 8014 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 216964917 is about 14729.7290199107. The cubic root of 216964917 is about 600.8921145619.

The spelling of 216964917 in words is "two hundred sixteen million, nine hundred sixty-four thousand, nine hundred seventeen".