171355397 has 2 divisors, whose sum is σ = 171355398. Its totient is φ = 171355396.

The previous prime is 171355369. The next prime is 171355417. The reversal of 171355397 is 793553171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168636196 + 2719201 = 12986^2 + 1649^2 .

It is a cyclic number.

It is not a de Polignac number, because 171355397 - 2¹⁴ = 171339013 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171355997) 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, 85677698 + 85677699.

It is an arithmetic number, because the mean of its divisors is an integer number (85677699).

Almost surely, 2^171355397 is an apocalyptic number.

It is an amenable number.

171355397 is a deficient number, since it is larger than the sum of its proper divisors (1).

171355397 is an equidigital number, since it uses as much as digits as its factorization.

171355397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 99225, while the sum is 41.

The square root of 171355397 is about 13090.2787212496. The cubic root of 171355397 is about 555.4341726114.

The spelling of 171355397 in words is "one hundred seventy-one million, three hundred fifty-five thousand, three hundred ninety-seven".