891330343331 has 2 divisors, whose sum is σ = 891330343332. Its totient is φ = 891330343330.

The previous prime is 891330343313. The next prime is 891330343369. The reversal of 891330343331 is 133343033198.

Together with previous prime (891330343313) 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 not a de Polignac number, because 891330343331 - 2²² = 891326149027 is a prime.

It is a super-2 number, since 2×891330343331² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (891330348331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445665171665 + 445665171666.

It is an arithmetic number, because the mean of its divisors is an integer number (445665171666).

Almost surely, 2^891330343331 is an apocalyptic number.

891330343331 is a deficient number, since it is larger than the sum of its proper divisors (1).

891330343331 is an equidigital number, since it uses as much as digits as its factorization.

891330343331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 41.

The spelling of 891330343331 in words is "eight hundred ninety-one billion, three hundred thirty million, three hundred forty-three thousand, three hundred thirty-one".