168561443 has 4 divisors (see below), whose sum is σ = 178476840. Its totient is φ = 158646048.

The previous prime is 168561439. The next prime is 168561469. The reversal of 168561443 is 344165861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 168561443 - 2² = 168561439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168561397 and 168561406.

It is not an unprimeable number, because it can be changed into a prime (168561433) 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, 4957673 + ... + 4957706.

It is an arithmetic number, because the mean of its divisors is an integer number (44619210).

Almost surely, 2^168561443 is an apocalyptic number.

168561443 is a deficient number, since it is larger than the sum of its proper divisors (9915397).

168561443 is an equidigital number, since it uses as much as digits as its factorization.

168561443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9915396.

The product of its digits is 69120, while the sum is 38.

The square root of 168561443 is about 12983.1214659650. The cubic root of 168561443 is about 552.3988258876.

The spelling of 168561443 in words is "one hundred sixty-eight million, five hundred sixty-one thousand, four hundred forty-three".