216243031 has 2 divisors, whose sum is σ = 216243032. Its totient is φ = 216243030.

The previous prime is 216243019. The next prime is 216243037. The reversal of 216243031 is 130342612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216243031 - 2⁷ = 216242903 is a prime.

It is a super-3 number, since 3×216243031³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 216242993 and 216243011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216243037) 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 as a sum of consecutive naturals, namely, 108121515 + 108121516.

It is an arithmetic number, because the mean of its divisors is an integer number (108121516).

Almost surely, 2^216243031 is an apocalyptic number.

216243031 is a deficient number, since it is larger than the sum of its proper divisors (1).

216243031 is an equidigital number, since it uses as much as digits as its factorization.

216243031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 216243031 is about 14705.2042148350. The cubic root of 216243031 is about 600.2249443599.

Adding to 216243031 its reverse (130342612), we get a palindrome (346585643).

The spelling of 216243031 in words is "two hundred sixteen million, two hundred forty-three thousand, thirty-one".