87198220789 has 2 divisors, whose sum is σ = 87198220790. Its totient is φ = 87198220788.

The previous prime is 87198220787. The next prime is 87198220807. The reversal of 87198220789 is 98702289178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47368040164 + 39830180625 = 217642^2 + 199575^2 .

It is a cyclic number.

It is not a de Polignac number, because 87198220789 - 2¹ = 87198220787 is a prime.

It is a super-4 number, since 4×87198220789⁴ (a number of 45 digits) contains 4444 as substring.

Together with 87198220787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87198220787) 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, 43599110394 + 43599110395.

It is an arithmetic number, because the mean of its divisors is an integer number (43599110395).

Almost surely, 2^87198220789 is an apocalyptic number.

It is an amenable number.

87198220789 is a deficient number, since it is larger than the sum of its proper divisors (1).

87198220789 is an equidigital number, since it uses as much as digits as its factorization.

87198220789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8128512, while the sum is 61.

The spelling of 87198220789 in words is "eighty-seven billion, one hundred ninety-eight million, two hundred twenty thousand, seven hundred eighty-nine".