1745621 has 2 divisors, whose sum is σ = 1745622. Its totient is φ = 1745620.

The previous prime is 1745599. The next prime is 1745629. The reversal of 1745621 is 1265471.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1661521 + 84100 = 1289^2 + 290^2 .

It is an emirp because it is prime and its reverse (1265471) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1745621 - 2¹⁰ = 1744597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1745629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 872810 + 872811.

It is an arithmetic number, because the mean of its divisors is an integer number (872811).

2^1745621 is an apocalyptic number.

It is an amenable number.

1745621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1745621 is an equidigital number, since it uses as much as digits as its factorization.

1745621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 26.

The square root of 1745621 is about 1321.2195124202. The cubic root of 1745621 is about 120.4065148441.

The spelling of 1745621 in words is "one million, seven hundred forty-five thousand, six hundred twenty-one".