97121789 has 2 divisors, whose sum is σ = 97121790. Its totient is φ = 97121788.

The previous prime is 97121777. The next prime is 97121797. The reversal of 97121789 is 98712179.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62805625 + 34316164 = 7925^2 + 5858^2 .

It is an emirp because it is prime and its reverse (98712179) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97121789 - 2⁸ = 97121533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97121389) 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, 48560894 + 48560895.

It is an arithmetic number, because the mean of its divisors is an integer number (48560895).

Almost surely, 2^97121789 is an apocalyptic number.

It is an amenable number.

97121789 is a deficient number, since it is larger than the sum of its proper divisors (1).

97121789 is an equidigital number, since it uses as much as digits as its factorization.

97121789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 44.

The square root of 97121789 is about 9855.0387619735. The cubic root of 97121789 is about 459.6623057134.

The spelling of 97121789 in words is "ninety-seven million, one hundred twenty-one thousand, seven hundred eighty-nine".