171220043 has 4 divisors (see below), whose sum is σ = 171246240. Its totient is φ = 171193848.

The previous prime is 171220033. The next prime is 171220057. The reversal of 171220043 is 340022171.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 171220043 - 2²² = 167025739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 171219997 and 171220024.

It is not an unprimeable number, because it can be changed into a prime (171220033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5678 + ... + 19356.

It is an arithmetic number, because the mean of its divisors is an integer number (42811560).

Almost surely, 2^171220043 is an apocalyptic number.

171220043 is a deficient number, since it is larger than the sum of its proper divisors (26197).

171220043 is a wasteful number, since it uses less digits than its factorization.

171220043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26196.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 171220043 is about 13085.1076801072. The cubic root of 171220043 is about 555.2878878683.

The spelling of 171220043 in words is "one hundred seventy-one million, two hundred twenty thousand, forty-three".