2173523 has 16 divisors (see below), whose sum is σ = 2529792. Its totient is φ = 1863400.

The previous prime is 2173519. The next prime is 2173529. The reversal of 2173523 is 3253712.

It is not a de Polignac number, because 2173523 - 2² = 2173519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a d-powerful number, because it can be written as 2¹³ + 1 + 7⁴ + 3⁹ + 5⁹ + 2¹⁷ + 3¹⁰ .

It is a Duffinian number.

Its product of digits (1260) is a multiple of the sum of its prime divisors (105).

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30578 + ... + 30648.

It is an arithmetic number, because the mean of its divisors is an integer number (158112).

2^2173523 is an apocalyptic number.

2173523 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2173523 is a deficient number, since it is larger than the sum of its proper divisors (356269).

2173523 is an equidigital number, since it uses as much as digits as its factorization.

2173523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127 (or 105 counting only the distinct ones).

The product of its digits is 1260, while the sum is 23.

The square root of 2173523 is about 1474.2872854366. The cubic root of 2173523 is about 129.5352835388.

The spelling of 2173523 in words is "two million, one hundred seventy-three thousand, five hundred twenty-three".