171553 has 2 divisors, whose sum is σ = 171554. Its totient is φ = 171552.

The previous prime is 171541. The next prime is 171559. The reversal of 171553 is 355171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134689 + 36864 = 367^2 + 192^2 .

It is an emirp because it is prime and its reverse (355171) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171553 is a prime.

It is equal to p₁₅₆₂₈ and since 171553 and 15628 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (171559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85776 + 85777.

It is an arithmetic number, because the mean of its divisors is an integer number (85777).

2¹⁷¹⁵⁵³ is an apocalyptic number.

It is an amenable number.

171553 is a deficient number, since it is larger than the sum of its proper divisors (1).

171553 is an equidigital number, since it uses as much as digits as its factorization.

171553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 525, while the sum is 22.

The square root of 171553 is about 414.1895701246. The cubic root of 171553 is about 55.5647595121.

The spelling of 171553 in words is "one hundred seventy-one thousand, five hundred fifty-three".