216085393 has 2 divisors, whose sum is σ = 216085394. Its totient is φ = 216085392.

The previous prime is 216085381. The next prime is 216085403. The reversal of 216085393 is 393580612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175483009 + 40602384 = 13247^2 + 6372^2 .

It is a cyclic number.

It is not a de Polignac number, because 216085393 - 2⁵ = 216085361 is a prime.

It is equal to p_11918854 and since 216085393 and 11918854 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (216085333) 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, 108042696 + 108042697.

It is an arithmetic number, because the mean of its divisors is an integer number (108042697).

Almost surely, 2^216085393 is an apocalyptic number.

It is an amenable number.

216085393 is a deficient number, since it is larger than the sum of its proper divisors (1).

216085393 is an equidigital number, since it uses as much as digits as its factorization.

216085393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 216085393 is about 14699.8432984845. The cubic root of 216085393 is about 600.0790571754.

The spelling of 216085393 in words is "two hundred sixteen million, eighty-five thousand, three hundred ninety-three".