219217091851 has 2 divisors, whose sum is σ = 219217091852. Its totient is φ = 219217091850.

The previous prime is 219217091839. The next prime is 219217091869. The reversal of 219217091851 is 158190712912.

219217091851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 219217091851 - 2²¹ = 219214994699 is a prime.

It is a super-2 number, since 2×219217091851² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (219217091551) 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, 109608545925 + 109608545926.

It is an arithmetic number, because the mean of its divisors is an integer number (109608545926).

Almost surely, 2^219217091851 is an apocalyptic number.

219217091851 is a deficient number, since it is larger than the sum of its proper divisors (1).

219217091851 is an equidigital number, since it uses as much as digits as its factorization.

219217091851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 46.

The spelling of 219217091851 in words is "two hundred nineteen billion, two hundred seventeen million, ninety-one thousand, eight hundred fifty-one".