161879811 has 8 divisors (see below), whose sum is σ = 216459600. Its totient is φ = 107609952.

The previous prime is 161879807. The next prime is 161879813. The reversal of 161879811 is 118978161.

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

It is not a de Polignac number, because 161879811 - 2² = 161879807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161879813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76260 + ... + 78353.

It is an arithmetic number, because the mean of its divisors is an integer number (27057450).

Almost surely, 2^161879811 is an apocalyptic number.

161879811 is a deficient number, since it is larger than the sum of its proper divisors (54579789).

161879811 is a wasteful number, since it uses less digits than its factorization.

161879811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154965.

The product of its digits is 24192, while the sum is 42.

The square root of 161879811 is about 12723.1997154804. The cubic root of 161879811 is about 545.0013309734.

The spelling of 161879811 in words is "one hundred sixty-one million, eight hundred seventy-nine thousand, eight hundred eleven".