171961878 has 16 divisors (see below), whose sum is σ = 375189696. Its totient is φ = 52109640.

The previous prime is 171961873. The next prime is 171961901. The reversal of 171961878 is 878169171.

171961878 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171961871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1302676 + ... + 1302807.

It is an arithmetic number, because the mean of its divisors is an integer number (23449356).

Almost surely, 2^171961878 is an apocalyptic number.

171961878 is an abundant number, since it is smaller than the sum of its proper divisors (203227818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

171961878 is a wasteful number, since it uses less digits than its factorization.

171961878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2605499.

The product of its digits is 169344, while the sum is 48.

The square root of 171961878 is about 13113.4235804385. The cubic root of 171961878 is about 556.0886868346.

The spelling of 171961878 in words is "one hundred seventy-one million, nine hundred sixty-one thousand, eight hundred seventy-eight".