161920843 has 48 divisors (see below), whose sum is σ = 207381504. Its totient is φ = 125737920.

The previous prime is 161920813. The next prime is 161920873. The reversal of 161920843 is 348029161.

It is an interprime number because it is at equal distance from previous prime (161920813) and next prime (161920873).

It is not a de Polignac number, because 161920843 - 2²¹ = 159823691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161920799 and 161920808.

It is not an unprimeable number, because it can be changed into a prime (161920813) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2416696 + ... + 2416762.

It is an arithmetic number, because the mean of its divisors is an integer number (4320448).

Almost surely, 2^161920843 is an apocalyptic number.

161920843 is a deficient number, since it is larger than the sum of its proper divisors (45460661).

161920843 is a wasteful number, since it uses less digits than its factorization.

161920843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 161920843 is about 12724.8121007738. The cubic root of 161920843 is about 545.0473746097.

The spelling of 161920843 in words is "one hundred sixty-one million, nine hundred twenty thousand, eight hundred forty-three".