171224872549 has 2 divisors, whose sum is σ = 171224872550. Its totient is φ = 171224872548.

The previous prime is 171224872541. The next prime is 171224872573. The reversal of 171224872549 is 945278422171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171183270049 + 41602500 = 413743^2 + 6450^2 .

It is an emirp because it is prime and its reverse (945278422171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171224872549 - 2³ = 171224872541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 171224872496 and 171224872505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171224872541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85612436274 + 85612436275.

It is an arithmetic number, because the mean of its divisors is an integer number (85612436275).

Almost surely, 2^171224872549 is an apocalyptic number.

It is an amenable number.

171224872549 is a deficient number, since it is larger than the sum of its proper divisors (1).

171224872549 is an equidigital number, since it uses as much as digits as its factorization.

171224872549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 52.

The spelling of 171224872549 in words is "one hundred seventy-one billion, two hundred twenty-four million, eight hundred seventy-two thousand, five hundred forty-nine".