216825331 has 2 divisors, whose sum is σ = 216825332. Its totient is φ = 216825330.

The previous prime is 216825313. The next prime is 216825391. The reversal of 216825331 is 133528612.

Together with previous prime (216825313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216825331 is a prime.

It is a super-2 number, since 2×216825331² = 94026448326519122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216825293 and 216825302.

It is not a weakly prime, because it can be changed into another prime (216825311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108412665 + 108412666.

It is an arithmetic number, because the mean of its divisors is an integer number (108412666).

Almost surely, 2^216825331 is an apocalyptic number.

216825331 is a deficient number, since it is larger than the sum of its proper divisors (1).

216825331 is an equidigital number, since it uses as much as digits as its factorization.

216825331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 216825331 is about 14724.9900169745. The cubic root of 216825331 is about 600.7632241070.

It can be divided in two parts, 216825 and 331, that added together give a square (217156 = 466²).

The spelling of 216825331 in words is "two hundred sixteen million, eight hundred twenty-five thousand, three hundred thirty-one".