878648161 has 2 divisors, whose sum is σ = 878648162. Its totient is φ = 878648160.

The previous prime is 878648153. The next prime is 878648189. The reversal of 878648161 is 161846878.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 515517025 + 363131136 = 22705^2 + 19056^2 .

It is a cyclic number.

It is not a de Polignac number, because 878648161 - 2³ = 878648153 is a prime.

It is not a weakly prime, because it can be changed into another prime (878648261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439324080 + 439324081.

It is an arithmetic number, because the mean of its divisors is an integer number (439324081).

Almost surely, 2^878648161 is an apocalyptic number.

It is an amenable number.

878648161 is a deficient number, since it is larger than the sum of its proper divisors (1).

878648161 is an equidigital number, since it uses as much as digits as its factorization.

878648161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 516096, while the sum is 49.

The square root of 878648161 is about 29641.9999493961. Note that the first 4 decimals coincide. The cubic root of 878648161 is about 957.7930208222.

The spelling of 878648161 in words is "eight hundred seventy-eight million, six hundred forty-eight thousand, one hundred sixty-one".