1643013 has 12 divisors (see below), whose sum is σ = 2384928. Its totient is φ = 1089960.

The previous prime is 1643003. The next prime is 1643021. The reversal of 1643013 is 3103461.

It is not a de Polignac number, because 1643013 - 2⁴ = 1642997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2506 + ... + 3092.

It is an arithmetic number, because the mean of its divisors is an integer number (198744).

2^1643013 is an apocalyptic number.

It is an amenable number.

1643013 is a deficient number, since it is larger than the sum of its proper divisors (741915).

1643013 is a wasteful number, since it uses less digits than its factorization.

1643013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904 (or 901 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1643013 is about 1281.8006865344. The cubic root of 1643013 is about 117.9995451481. Note that the first 3 decimals are identical.

Adding to 1643013 its reverse (3103461), we get a palindrome (4746474).

The spelling of 1643013 in words is "one million, six hundred forty-three thousand, thirteen".