878841121 has 2 divisors, whose sum is σ = 878841122. Its totient is φ = 878841120.

The previous prime is 878841107. The next prime is 878841137. The reversal of 878841121 is 121148878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 872907025 + 5934096 = 29545^2 + 2436^2 .

It is a cyclic number.

It is not a de Polignac number, because 878841121 - 2¹⁹ = 878316833 is a prime.

It is not a weakly prime, because it can be changed into another prime (878841151) 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, 439420560 + 439420561.

It is an arithmetic number, because the mean of its divisors is an integer number (439420561).

Almost surely, 2^878841121 is an apocalyptic number.

It is an amenable number.

878841121 is a deficient number, since it is larger than the sum of its proper divisors (1).

878841121 is an equidigital number, since it uses as much as digits as its factorization.

878841121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28672, while the sum is 40.

The square root of 878841121 is about 29645.2546118262. The cubic root of 878841121 is about 957.8631293602.

Adding to 878841121 its reverse (121148878), we get a palindrome (999989999).

The spelling of 878841121 in words is "eight hundred seventy-eight million, eight hundred forty-one thousand, one hundred twenty-one".