891385685033 has 2 divisors, whose sum is σ = 891385685034. Its totient is φ = 891385685032.

The previous prime is 891385685023. The next prime is 891385685041. The reversal of 891385685033 is 330586583198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 881781097024 + 9604588009 = 939032^2 + 98003^2 .

It is a cyclic number.

It is not a de Polignac number, because 891385685033 - 2¹⁰ = 891385684009 is a prime.

It is a super-2 number, since 2×891385685033² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (891385685023) 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, 445692842516 + 445692842517.

It is an arithmetic number, because the mean of its divisors is an integer number (445692842517).

Almost surely, 2^891385685033 is an apocalyptic number.

It is an amenable number.

891385685033 is a deficient number, since it is larger than the sum of its proper divisors (1).

891385685033 is an equidigital number, since it uses as much as digits as its factorization.

891385685033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18662400, while the sum is 59.

The spelling of 891385685033 in words is "eight hundred ninety-one billion, three hundred eighty-five million, six hundred eighty-five thousand, thirty-three".