216017919 has 24 divisors (see below), whose sum is σ = 339022320. Its totient is φ = 131749632.

The previous prime is 216017911. The next prime is 216017927. The reversal of 216017919 is 919710612.

It is an interprime number because it is at equal distance from previous prime (216017911) and next prime (216017927).

It is not a de Polignac number, because 216017919 - 2³ = 216017911 is a prime.

It is a super-2 number, since 2×216017919² = 93327482658181122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216017911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5052 + ... + 21390.

It is an arithmetic number, because the mean of its divisors is an integer number (14125930).

Almost surely, 2^216017919 is an apocalyptic number.

216017919 is a deficient number, since it is larger than the sum of its proper divisors (123004401).

216017919 is a wasteful number, since it uses less digits than its factorization.

216017919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16471 (or 16468 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 36.

The square root of 216017919 is about 14697.5480608161. The cubic root of 216017919 is about 600.0165912079.

The spelling of 216017919 in words is "two hundred sixteen million, seventeen thousand, nine hundred nineteen".