171681201 has 12 divisors (see below), whose sum is σ = 257168912. Its totient is φ = 114453972.

The previous prime is 171681199. The next prime is 171681203. The reversal of 171681201 is 102186171.

It is an interprime number because it is at equal distance from previous prime (171681199) and next prime (171681203).

It is not a de Polignac number, because 171681201 - 2¹ = 171681199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (171681203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 353011 + ... + 353496.

Almost surely, 2^171681201 is an apocalyptic number.

It is an amenable number.

171681201 is a deficient number, since it is larger than the sum of its proper divisors (85487711).

171681201 is an frugal number, since it uses more digits than its factorization.

171681201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706522 (or 706510 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 27.

The square root of 171681201 is about 13102.7173135957. The cubic root of 171681201 is about 555.7859718721.

The spelling of 171681201 in words is "one hundred seventy-one million, six hundred eighty-one thousand, two hundred one".