84109121 has 2 divisors, whose sum is σ = 84109122. Its totient is φ = 84109120.

The previous prime is 84109093. The next prime is 84109127. The reversal of 84109121 is 12190148.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60450625 + 23658496 = 7775^2 + 4864^2 .

It is a cyclic number.

It is not a de Polignac number, because 84109121 - 2¹⁸ = 83846977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84109127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42054560 + 42054561.

It is an arithmetic number, because the mean of its divisors is an integer number (42054561).

Almost surely, 2^84109121 is an apocalyptic number.

It is an amenable number.

84109121 is a deficient number, since it is larger than the sum of its proper divisors (1).

84109121 is an equidigital number, since it uses as much as digits as its factorization.

84109121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 84109121 is about 9171.1024964287. The cubic root of 84109121 is about 438.1414737976.

Adding to 84109121 its reverse (12190148), we get a palindrome (96299269).

The spelling of 84109121 in words is "eighty-four million, one hundred nine thousand, one hundred twenty-one".