161863 has 4 divisors (see below), whose sum is σ = 174328. Its totient is φ = 149400.

The previous prime is 161839. The next prime is 161869. The reversal of 161863 is 368161.

161863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 368161 = 23 ⋅16007.

It is a cyclic number.

It is not a de Polignac number, because 161863 - 2⁵ = 161831 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 (161869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6213 + ... + 6238.

It is an arithmetic number, because the mean of its divisors is an integer number (43582).

2¹⁶¹⁸⁶³ is an apocalyptic number.

161863 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

161863 is a deficient number, since it is larger than the sum of its proper divisors (12465).

161863 is a wasteful number, since it uses less digits than its factorization.

161863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12464.

The product of its digits is 864, while the sum is 25.

The square root of 161863 is about 402.3220103350. The cubic root of 161863 is about 54.4982464436.

It can be divided in two parts, 1618 and 63, that added together give a square (1681 = 41²).

The spelling of 161863 in words is "one hundred sixty-one thousand, eight hundred sixty-three".