1663241 has 4 divisors (see below), whose sum is σ = 1750800. Its totient is φ = 1575684.

The previous prime is 1663223. The next prime is 1663267. The reversal of 1663241 is 1423661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1423661 = 641 ⋅2221.

It is a cyclic number.

It is not a de Polignac number, because 1663241 - 2¹⁰ = 1662217 is a prime.

It is a d-powerful number, because it can be written as 1 + 6² + 6⁴ + 3¹³ + 2¹¹ + 4⁸ + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1668241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43751 + ... + 43788.

It is an arithmetic number, because the mean of its divisors is an integer number (437700).

2^1663241 is an apocalyptic number.

It is an amenable number.

1663241 is a deficient number, since it is larger than the sum of its proper divisors (87559).

1663241 is an equidigital number, since it uses as much as digits as its factorization.

1663241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87558.

The product of its digits is 864, while the sum is 23.

The square root of 1663241 is about 1289.6670112862. The cubic root of 1663241 is about 118.4818228927.

The spelling of 1663241 in words is "one million, six hundred sixty-three thousand, two hundred forty-one".