28209091093 has 2 divisors, whose sum is σ = 28209091094. Its totient is φ = 28209091092.

The previous prime is 28209091087. The next prime is 28209091139. The reversal of 28209091093 is 39019090282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27240512209 + 968578884 = 165047^2 + 31122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28209091093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28209091013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14104545546 + 14104545547.

It is an arithmetic number, because the mean of its divisors is an integer number (14104545547).

Almost surely, 2^28209091093 is an apocalyptic number.

It is an amenable number.

28209091093 is a deficient number, since it is larger than the sum of its proper divisors (1).

28209091093 is an equidigital number, since it uses as much as digits as its factorization.

28209091093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 43.

The spelling of 28209091093 in words is "twenty-eight billion, two hundred nine million, ninety-one thousand, ninety-three".