172491 has 8 divisors (see below), whose sum is σ = 250944. Its totient is φ = 104520.

The previous prime is 172489. The next prime is 172507. The reversal of 172491 is 194271.

172491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 172491 - 2¹ = 172489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2581 + ... + 2646.

It is an arithmetic number, because the mean of its divisors is an integer number (31368).

2¹⁷²⁴⁹¹ is an apocalyptic number.

172491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

172491 is a deficient number, since it is larger than the sum of its proper divisors (78453).

172491 is a wasteful number, since it uses less digits than its factorization.

172491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5241.

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

The square root of 172491 is about 415.3203582778. The cubic root of 172491 is about 55.6658459407.

The spelling of 172491 in words is "one hundred seventy-two thousand, four hundred ninety-one".