161203861 has 24 divisors (see below), whose sum is σ = 204198720. Its totient is φ = 124540416.

The previous prime is 161203853. The next prime is 161203891. The reversal of 161203861 is 168302161.

It is not a de Polignac number, because 161203861 - 2³ = 161203853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161203811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49285 + ... + 52453.

It is an arithmetic number, because the mean of its divisors is an integer number (8508280).

Almost surely, 2^161203861 is an apocalyptic number.

It is an amenable number.

161203861 is a deficient number, since it is larger than the sum of its proper divisors (42994859).

161203861 is a wasteful number, since it uses less digits than its factorization.

161203861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3245 (or 3232 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 161203861 is about 12696.6082478747. The cubic root of 161203861 is about 544.2416982587.

The spelling of 161203861 in words is "one hundred sixty-one million, two hundred three thousand, eight hundred sixty-one".