1643063 has 4 divisors (see below), whose sum is σ = 1729560. Its totient is φ = 1556568.

The previous prime is 1643039. The next prime is 1643069. The reversal of 1643063 is 3603461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3603461 = 67 ⋅53783.

It is a cyclic number.

It is not a de Polignac number, because 1643063 - 2⁸ = 1642807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643069) 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, 43220 + ... + 43257.

It is an arithmetic number, because the mean of its divisors is an integer number (432390).

2^1643063 is an apocalyptic number.

1643063 is a deficient number, since it is larger than the sum of its proper divisors (86497).

1643063 is an equidigital number, since it uses as much as digits as its factorization.

1643063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86496.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 1643063 is about 1281.8201901983. The cubic root of 1643063 is about 118.0007421192. Note that the first 3 decimals are identical.

The spelling of 1643063 in words is "one million, six hundred forty-three thousand, sixty-three".