90811219789 has 2 divisors, whose sum is σ = 90811219790. Its totient is φ = 90811219788.

The previous prime is 90811219757. The next prime is 90811219897. The reversal of 90811219789 is 98791211809.

Together with next prime (90811219897) 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., 66711141225 + 24100078564 = 258285^2 + 155242^2 .

It is a cyclic number.

It is not a de Polignac number, because 90811219789 - 2⁵ = 90811219757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90811219189) 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, 45405609894 + 45405609895.

It is an arithmetic number, because the mean of its divisors is an integer number (45405609895).

Almost surely, 2^90811219789 is an apocalyptic number.

It is an amenable number.

90811219789 is a deficient number, since it is larger than the sum of its proper divisors (1).

90811219789 is an equidigital number, since it uses as much as digits as its factorization.

90811219789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 55.

The spelling of 90811219789 in words is "ninety billion, eight hundred eleven million, two hundred nineteen thousand, seven hundred eighty-nine".