161878841 has 8 divisors (see below), whose sum is σ = 176275200. Its totient is φ = 148070160.

The previous prime is 161878837. The next prime is 161878877. The reversal of 161878841 is 148878161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161878841 - 2² = 161878837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161878792 and 161878801.

It is not an unprimeable number, because it can be changed into a prime (161874841) 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 7 ways as a sum of consecutive naturals, for example, 146345 + ... + 147446.

It is an arithmetic number, because the mean of its divisors is an integer number (22034400).

Almost surely, 2^161878841 is an apocalyptic number.

It is an amenable number.

161878841 is a deficient number, since it is larger than the sum of its proper divisors (14396359).

161878841 is a wasteful number, since it uses less digits than its factorization.

161878841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293839.

The product of its digits is 86016, while the sum is 44.

The square root of 161878841 is about 12723.1615960814. The cubic root of 161878841 is about 545.0002424037. Note that the first 3 decimals are identical.

The spelling of 161878841 in words is "one hundred sixty-one million, eight hundred seventy-eight thousand, eight hundred forty-one".