97789 has 2 divisors, whose sum is σ = 97790. Its totient is φ = 97788.

The previous prime is 97787. The next prime is 97813. The reversal of 97789 is 98779.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84100 + 13689 = 290^2 + 117^2 .

It is an emirp because it is prime and its reverse (98779) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97789 - 2¹ = 97787 is a prime.

Together with 97787, it forms a pair of twin primes.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48894 + 48895.

It is an arithmetic number, because the mean of its divisors is an integer number (48895).

2⁹⁷⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

97789 is a deficient number, since it is larger than the sum of its proper divisors (1).

97789 is an equidigital number, since it uses as much as digits as its factorization.

97789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 40.

The square root of 97789 is about 312.7123278670. The cubic root of 97789 is about 46.0712506396.

Subtracting 97789 from its reverse (98779), we obtain a triangular number (990 = T₄₄).

The spelling of 97789 in words is "ninety-seven thousand, seven hundred eighty-nine".