1006021643 has 4 divisors (see below), whose sum is σ = 1097478168. Its totient is φ = 914565120.

The previous prime is 1006021613. The next prime is 1006021661. The reversal of 1006021643 is 3461206001.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1006021643 - 2¹⁰ = 1006020619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1006021613) 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, 45728246 + ... + 45728267.

It is an arithmetic number, because the mean of its divisors is an integer number (274369542).

Almost surely, 2^1006021643 is an apocalyptic number.

1006021643 is a deficient number, since it is larger than the sum of its proper divisors (91456525).

1006021643 is an equidigital number, since it uses as much as digits as its factorization.

1006021643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91456524.

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

The square root of 1006021643 is about 31717.8442363285. The cubic root of 1006021643 is about 1002.0031988482.

Adding to 1006021643 its reverse (3461206001), we get a palindrome (4467227644).

The spelling of 1006021643 in words is "one billion, six million, twenty-one thousand, six hundred forty-three".