171172421 has 8 divisors (see below), whose sum is σ = 201936384. Its totient is φ = 141986160.

The previous prime is 171172403. The next prime is 171172423. The reversal of 171172421 is 124271171.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171172421 is a prime.

It is a super-2 number, since 2×171172421² = 58599995422002482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171172423) 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 in 7 ways as a sum of consecutive naturals, for example, 394190 + ... + 394623.

It is an arithmetic number, because the mean of its divisors is an integer number (25242048).

Almost surely, 2^171172421 is an apocalyptic number.

It is an amenable number.

171172421 is a deficient number, since it is larger than the sum of its proper divisors (30763963).

171172421 is an equidigital number, since it uses as much as digits as its factorization.

171172421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788851.

The product of its digits is 784, while the sum is 26.

The square root of 171172421 is about 13083.2878513010. The cubic root of 171172421 is about 555.2364017390.

The spelling of 171172421 in words is "one hundred seventy-one million, one hundred seventy-two thousand, four hundred twenty-one".