216143647 has 4 divisors (see below), whose sum is σ = 220742496. Its totient is φ = 211544800.

The previous prime is 216143633. The next prime is 216143693. The reversal of 216143647 is 746341612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216143647 - 2⁷ = 216143519 is a prime.

It is a super-2 number, since 2×216143647² = 93436152276921218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216143047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2299354 + ... + 2299447.

It is an arithmetic number, because the mean of its divisors is an integer number (55185624).

Almost surely, 2^216143647 is an apocalyptic number.

216143647 is a deficient number, since it is larger than the sum of its proper divisors (4598849).

216143647 is an equidigital number, since it uses as much as digits as its factorization.

216143647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4598848.

The product of its digits is 24192, while the sum is 34.

The square root of 216143647 is about 14701.8246146524. The cubic root of 216143647 is about 600.1329770078.

The spelling of 216143647 in words is "two hundred sixteen million, one hundred forty-three thousand, six hundred forty-seven".