171683538541 has 2 divisors, whose sum is σ = 171683538542. Its totient is φ = 171683538540.

The previous prime is 171683538529. The next prime is 171683538563. The reversal of 171683538541 is 145835386171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127427580900 + 44255957641 = 356970^2 + 210371^2 .

It is an emirp because it is prime and its reverse (145835386171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171683538541 - 2¹⁹ = 171683014253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171683538041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85841769270 + 85841769271.

It is an arithmetic number, because the mean of its divisors is an integer number (85841769271).

Almost surely, 2^171683538541 is an apocalyptic number.

It is an amenable number.

171683538541 is a deficient number, since it is larger than the sum of its proper divisors (1).

171683538541 is an equidigital number, since it uses as much as digits as its factorization.

171683538541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2419200, while the sum is 52.

The spelling of 171683538541 in words is "one hundred seventy-one billion, six hundred eighty-three million, five hundred thirty-eight thousand, five hundred forty-one".