172171887 has 8 divisors (see below), whose sum is σ = 232707504. Its totient is φ = 113208768.

The previous prime is 172171837. The next prime is 172171891. The reversal of 172171887 is 788171271.

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

It is not a de Polignac number, because 172171887 - 2¹⁰ = 172170863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172171807) 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, 392868 + ... + 393305.

It is an arithmetic number, because the mean of its divisors is an integer number (29088438).

Almost surely, 2^172171887 is an apocalyptic number.

172171887 is a deficient number, since it is larger than the sum of its proper divisors (60535617).

172171887 is an equidigital number, since it uses as much as digits as its factorization.

172171887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786249.

The product of its digits is 43904, while the sum is 42.

The square root of 172171887 is about 13121.4285426549. The cubic root of 172171887 is about 556.3149697794.

The spelling of 172171887 in words is "one hundred seventy-two million, one hundred seventy-one thousand, eight hundred eighty-seven".