28213544197 has 2 divisors, whose sum is σ = 28213544198. Its totient is φ = 28213544196.

The previous prime is 28213544173. The next prime is 28213544213. The reversal of 28213544197 is 79144531282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17016941601 + 11196602596 = 130449^2 + 105814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28213544197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28213544167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14106772098 + 14106772099.

It is an arithmetic number, because the mean of its divisors is an integer number (14106772099).

Almost surely, 2^28213544197 is an apocalyptic number.

It is an amenable number.

28213544197 is a deficient number, since it is larger than the sum of its proper divisors (1).

28213544197 is an equidigital number, since it uses as much as digits as its factorization.

28213544197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 46.

The spelling of 28213544197 in words is "twenty-eight billion, two hundred thirteen million, five hundred forty-four thousand, one hundred ninety-seven".