171561043 has 2 divisors, whose sum is σ = 171561044. Its totient is φ = 171561042.

The previous prime is 171561041. The next prime is 171561101. The reversal of 171561043 is 340165171.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 171561043 - 2¹ = 171561041 is a prime.

Together with 171561041, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (171561041) 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 as a sum of consecutive naturals, namely, 85780521 + 85780522.

It is an arithmetic number, because the mean of its divisors is an integer number (85780522).

Almost surely, 2^171561043 is an apocalyptic number.

171561043 is a deficient number, since it is larger than the sum of its proper divisors (1).

171561043 is an equidigital number, since it uses as much as digits as its factorization.

171561043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 171561043 is about 13098.1312789268. The cubic root of 171561043 is about 555.6562785480.

The spelling of 171561043 in words is "one hundred seventy-one million, five hundred sixty-one thousand, forty-three".