878556161 has 4 divisors (see below), whose sum is σ = 1004064192. Its totient is φ = 753048132.

The previous prime is 878556137. The next prime is 878556163. The reversal of 878556161 is 161655878.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 161655878 = 2 ⋅80827939.

It is a cyclic number.

It is not a de Polignac number, because 878556161 - 2⁶ = 878556097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (878556163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62754005 + ... + 62754018.

It is an arithmetic number, because the mean of its divisors is an integer number (251016048).

Almost surely, 2^878556161 is an apocalyptic number.

It is an amenable number.

878556161 is a deficient number, since it is larger than the sum of its proper divisors (125508031).

878556161 is a wasteful number, since it uses less digits than its factorization.

878556161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125508030.

The product of its digits is 403200, while the sum is 47.

The square root of 878556161 is about 29640.4480566674. The cubic root of 878556161 is about 957.7595906669.

It can be divided in two parts, 8785 and 56161, that added together give a palindrome (64946).

The spelling of 878556161 in words is "eight hundred seventy-eight million, five hundred fifty-six thousand, one hundred sixty-one".