216346331 has 4 divisors (see below), whose sum is σ = 227733000. Its totient is φ = 204959664.

The previous prime is 216346309. The next prime is 216346357. The reversal of 216346331 is 133643612.

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 216346331 - 2²⁶ = 149237467 is a prime.

It is a super-2 number, since 2×216346331² = 93611469874323122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216346294 and 216346303.

It is not an unprimeable number, because it can be changed into a prime (216340331) 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 3 ways as a sum of consecutive naturals, for example, 5693306 + ... + 5693343.

It is an arithmetic number, because the mean of its divisors is an integer number (56933250).

Almost surely, 2^216346331 is an apocalyptic number.

216346331 is a deficient number, since it is larger than the sum of its proper divisors (11386669).

216346331 is a wasteful number, since it uses less digits than its factorization.

216346331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11386668.

The product of its digits is 7776, while the sum is 29.

The square root of 216346331 is about 14708.7161574354. The cubic root of 216346331 is about 600.3205056150.

Adding to 216346331 its reverse (133643612), we get a palindrome (349989943).

The spelling of 216346331 in words is "two hundred sixteen million, three hundred forty-six thousand, three hundred thirty-one".