161918343 has 24 divisors (see below), whose sum is σ = 236592720. Its totient is φ = 106704000.

The previous prime is 161918329. The next prime is 161918347. The reversal of 161918343 is 343819161.

161918343 is a `hidden beast` number, since 1 + 619 + 1 + 8 + 34 + 3 = 666.

It is not a de Polignac number, because 161918343 - 2⁵ = 161918311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161918298 and 161918307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161918347) 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, 517155 + ... + 517467.

It is an arithmetic number, because the mean of its divisors is an integer number (9858030).

Almost surely, 2^161918343 is an apocalyptic number.

161918343 is a deficient number, since it is larger than the sum of its proper divisors (74674377).

161918343 is a wasteful number, since it uses less digits than its factorization.

161918343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799 (or 796 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 161918343 is about 12724.7138671170. The cubic root of 161918343 is about 545.0445694830.

It can be divided in two parts, 161918 and 343, that added together give a palindrome (162261).

The spelling of 161918343 in words is "one hundred sixty-one million, nine hundred eighteen thousand, three hundred forty-three".