216043031 has 2 divisors, whose sum is σ = 216043032. Its totient is φ = 216043030.

The previous prime is 216043019. The next prime is 216043081. The reversal of 216043031 is 130340612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216043031 is a prime.

It is a super-2 number, since 2×216043031² = 93349182487333922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 216042994 and 216043012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216043081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108021515 + 108021516.

It is an arithmetic number, because the mean of its divisors is an integer number (108021516).

Almost surely, 2^216043031 is an apocalyptic number.

216043031 is a deficient number, since it is larger than the sum of its proper divisors (1).

216043031 is an equidigital number, since it uses as much as digits as its factorization.

216043031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 216043031 is about 14698.4023281444. The cubic root of 216043031 is about 600.0398408730.

Adding to 216043031 its reverse (130340612), we get a palindrome (346383643).

The spelling of 216043031 in words is "two hundred sixteen million, forty-three thousand, thirty-one".