1644361 has 2 divisors, whose sum is σ = 1644362. Its totient is φ = 1644360.

The previous prime is 1644347. The next prime is 1644367. The reversal of 1644361 is 1634461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1336336 + 308025 = 1156^2 + 555^2 .

It is an emirp because it is prime and its reverse (1634461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1644361 - 2⁷ = 1644233 is a prime.

It is a super-3 number, since 3×1644361³ = 13338677069634653643, which contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1644367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822180 + 822181.

It is an arithmetic number, because the mean of its divisors is an integer number (822181).

2^1644361 is an apocalyptic number.

It is an amenable number.

1644361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644361 is an equidigital number, since it uses as much as digits as its factorization.

1644361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 1644361 is about 1282.3264015063. The cubic root of 1644361 is about 118.0318069959.

Adding to 1644361 its product of digits (1728), we get a square (1646089 = 1283²).

The spelling of 1644361 in words is "one million, six hundred forty-four thousand, three hundred sixty-one".