172149 has 4 divisors (see below), whose sum is σ = 229536. Its totient is φ = 114764.

The previous prime is 172147. The next prime is 172153. The reversal of 172149 is 941271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172149 - 2¹ = 172147 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28689 + ... + 28694.

It is an arithmetic number, because the mean of its divisors is an integer number (57384).

2¹⁷²¹⁴⁹ is an apocalyptic number.

It is an amenable number.

172149 is a deficient number, since it is larger than the sum of its proper divisors (57387).

172149 is an equidigital number, since it uses as much as digits as its factorization.

172149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57386.

The product of its digits is 504, while the sum is 24.

The square root of 172149 is about 414.9084236310. The cubic root of 172149 is about 55.6290318165.

It can be divided in two parts, 1721 and 49, that added together give a triangular number (1770 = T₅₉).

The spelling of 172149 in words is "one hundred seventy-two thousand, one hundred forty-nine".