986941781789 has 2 divisors, whose sum is σ = 986941781790. Its totient is φ = 986941781788.

The previous prime is 986941781753. The next prime is 986941781879. The reversal of 986941781789 is 987187149689.

Together with next prime (986941781879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 757697129764 + 229244652025 = 870458^2 + 478795^2 .

It is a cyclic number.

It is not a de Polignac number, because 986941781789 - 2²⁰ = 986940733213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (986941781389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493470890894 + 493470890895.

It is an arithmetic number, because the mean of its divisors is an integer number (493470890895).

Almost surely, 2^986941781789 is an apocalyptic number.

It is an amenable number.

986941781789 is a deficient number, since it is larger than the sum of its proper divisors (1).

986941781789 is an equidigital number, since it uses as much as digits as its factorization.

986941781789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 438939648, while the sum is 77.

The spelling of 986941781789 in words is "nine hundred eighty-six billion, nine hundred forty-one million, seven hundred eighty-one thousand, seven hundred eighty-nine".