171121693 has 2 divisors, whose sum is σ = 171121694. Its totient is φ = 171121692.

The previous prime is 171121667. The next prime is 171121723. The reversal of 171121693 is 396121171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113998329 + 57123364 = 10677^2 + 7558^2 .

It is an emirp because it is prime and its reverse (396121171) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171121693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171121603) 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, 85560846 + 85560847.

It is an arithmetic number, because the mean of its divisors is an integer number (85560847).

Almost surely, 2^171121693 is an apocalyptic number.

It is an amenable number.

171121693 is a deficient number, since it is larger than the sum of its proper divisors (1).

171121693 is an equidigital number, since it uses as much as digits as its factorization.

171121693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 31.

The square root of 171121693 is about 13081.3490512256. The cubic root of 171121693 is about 555.1815470787.

The spelling of 171121693 in words is "one hundred seventy-one million, one hundred twenty-one thousand, six hundred ninety-three".