171740993 has 2 divisors, whose sum is σ = 171740994. Its totient is φ = 171740992.

The previous prime is 171740951. The next prime is 171741007. The reversal of 171740993 is 399047171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157954624 + 13786369 = 12568^2 + 3713^2 .

It is a cyclic number.

It is not a de Polignac number, because 171740993 - 2¹⁸ = 171478849 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 171740993.

It is not a weakly prime, because it can be changed into another prime (171740593) 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, 85870496 + 85870497.

It is an arithmetic number, because the mean of its divisors is an integer number (85870497).

Almost surely, 2^171740993 is an apocalyptic number.

It is an amenable number.

171740993 is a deficient number, since it is larger than the sum of its proper divisors (1).

171740993 is an equidigital number, since it uses as much as digits as its factorization.

171740993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 171740993 is about 13104.9987790919. The cubic root of 171740993 is about 555.8504862113.

The spelling of 171740993 in words is "one hundred seventy-one million, seven hundred forty thousand, nine hundred ninety-three".