216344131 has 2 divisors, whose sum is σ = 216344132. Its totient is φ = 216344130.

The previous prime is 216344123. The next prime is 216344153. The reversal of 216344131 is 131443612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216344131 - 2³ = 216344123 is a prime.

It is a super-2 number, since 2×216344131² = 93609566036290322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216344096 and 216344105.

It is not a weakly prime, because it can be changed into another prime (216344101) 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, 108172065 + 108172066.

It is an arithmetic number, because the mean of its divisors is an integer number (108172066).

Almost surely, 2^216344131 is an apocalyptic number.

216344131 is a deficient number, since it is larger than the sum of its proper divisors (1).

216344131 is an equidigital number, since it uses as much as digits as its factorization.

216344131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

The square root of 216344131 is about 14708.6413716563. The cubic root of 216344131 is about 600.3184707455.

Adding to 216344131 its reverse (131443612), we get a palindrome (347787743).

The spelling of 216344131 in words is "two hundred sixteen million, three hundred forty-four thousand, one hundred thirty-one".