891290785339 has 2 divisors, whose sum is σ = 891290785340. Its totient is φ = 891290785338.

The previous prime is 891290785337. The next prime is 891290785421. The reversal of 891290785339 is 933587092198.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 891290785339 - 2¹ = 891290785337 is a prime.

It is a super-2 number, since 2×891290785339² (a number of 25 digits) contains 22 as substring.

Together with 891290785337, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (891290785337) 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, 445645392669 + 445645392670.

It is an arithmetic number, because the mean of its divisors is an integer number (445645392670).

Almost surely, 2^891290785339 is an apocalyptic number.

891290785339 is a deficient number, since it is larger than the sum of its proper divisors (1).

891290785339 is an equidigital number, since it uses as much as digits as its factorization.

891290785339 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29393280, while the sum is 64.

The spelling of 891290785339 in words is "eight hundred ninety-one billion, two hundred ninety million, seven hundred eighty-five thousand, three hundred thirty-nine".