216091639 has 2 divisors, whose sum is σ = 216091640. Its totient is φ = 216091638.

The previous prime is 216091597. The next prime is 216091649. The reversal of 216091639 is 936190612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216091639 - 2¹⁷ = 215960567 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216091598 and 216091607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216091649) 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, 108045819 + 108045820.

It is an arithmetic number, because the mean of its divisors is an integer number (108045820).

Almost surely, 2^216091639 is an apocalyptic number.

216091639 is a deficient number, since it is larger than the sum of its proper divisors (1).

216091639 is an equidigital number, since it uses as much as digits as its factorization.

216091639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 216091639 is about 14700.0557481936. The cubic root of 216091639 is about 600.0848389293.

The spelling of 216091639 in words is "two hundred sixteen million, ninety-one thousand, six hundred thirty-nine".