219812391067481 has 2 divisors, whose sum is σ = 219812391067482. Its totient is φ = 219812391067480.

The previous prime is 219812391067453. The next prime is 219812391067537. The reversal of 219812391067481 is 184760193218912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192312687259225 + 27499703808256 = 13867685^2 + 5244016^2 .

It is a cyclic number.

It is not a de Polignac number, because 219812391067481 - 2⁶ = 219812391067417 is a prime.

It is a super-2 number, since 2×219812391067481² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (219812391067441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109906195533740 + 109906195533741.

It is an arithmetic number, because the mean of its divisors is an integer number (109906195533741).

Almost surely, 2^{219812391067481} is an apocalyptic number.

It is an amenable number.

219812391067481 is a deficient number, since it is larger than the sum of its proper divisors (1).

219812391067481 is an equidigital number, since it uses as much as digits as its factorization.

219812391067481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10450944, while the sum is 62.

The spelling of 219812391067481 in words is "two hundred nineteen trillion, eight hundred twelve billion, three hundred ninety-one million, sixty-seven thousand, four hundred eighty-one".