171225643 has 2 divisors, whose sum is σ = 171225644. Its totient is φ = 171225642.

The previous prime is 171225641. The next prime is 171225667. The reversal of 171225643 is 346522171.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 171225643 - 2¹ = 171225641 is a prime.

Together with 171225641, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (171225641) 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, 85612821 + 85612822.

It is an arithmetic number, because the mean of its divisors is an integer number (85612822).

Almost surely, 2^171225643 is an apocalyptic number.

171225643 is a deficient number, since it is larger than the sum of its proper divisors (1).

171225643 is an equidigital number, since it uses as much as digits as its factorization.

171225643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 171225643 is about 13085.3216620762. The cubic root of 171225643 is about 555.2939416344.

The spelling of 171225643 in words is "one hundred seventy-one million, two hundred twenty-five thousand, six hundred forty-three".