1724581 has 2 divisors, whose sum is σ = 1724582. Its totient is φ = 1724580.

The previous prime is 1724579. The next prime is 1724587. The reversal of 1724581 is 1854271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1404225 + 320356 = 1185^2 + 566^2 .

It is an emirp because it is prime and its reverse (1854271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1724581 - 2¹ = 1724579 is a prime.

It is a super-2 number, since 2×1724581² = 5948359251122, which contains 22 as substring.

Together with 1724579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1724587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 862290 + 862291.

It is an arithmetic number, because the mean of its divisors is an integer number (862291).

2^1724581 is an apocalyptic number.

It is an amenable number.

1724581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1724581 is an equidigital number, since it uses as much as digits as its factorization.

1724581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 28.

The square root of 1724581 is about 1313.2330333951. The cubic root of 1724581 is about 119.9208042266.

It can be divided in two parts, 172 and 4581, that added together give a triangular number (4753 = T₉₇).

The spelling of 1724581 in words is "one million, seven hundred twenty-four thousand, five hundred eighty-one".