1000605643 has 4 divisors (see below), whose sum is σ = 1005844608. Its totient is φ = 995366680.

The previous prime is 1000605637. The next prime is 1000605659. The reversal of 1000605643 is 3465060001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000605643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000605623) 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, 2619196 + ... + 2619577.

It is an arithmetic number, because the mean of its divisors is an integer number (251461152).

Almost surely, 2^1000605643 is an apocalyptic number.

1000605643 is a deficient number, since it is larger than the sum of its proper divisors (5238965).

1000605643 is an equidigital number, since it uses as much as digits as its factorization.

1000605643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5238964.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1000605643 is about 31632.3512088495. The cubic root of 1000605643 is about 1000.2018402578.

Adding to 1000605643 its reverse (3465060001), we get a palindrome (4465665644).

The spelling of 1000605643 in words is "one billion, six hundred five thousand, six hundred forty-three".