1002000019 has 4 divisors (see below), whose sum is σ = 1006414344. Its totient is φ = 997585696.

The previous prime is 1002000001. The next prime is 1002000029. The reversal of 1002000019 is 9100002001.

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 1002000019 - 2²⁵ = 968445587 is a prime.

It is a super-2 number, since 2×1002000019² = 2008008076152000722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001999972 and 1002000008.

It is not an unprimeable number, because it can be changed into a prime (1002000029) 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, 2206822 + ... + 2207275.

It is an arithmetic number, because the mean of its divisors is an integer number (251603586).

Almost surely, 2^1002000019 is an apocalyptic number.

1002000019 is a deficient number, since it is larger than the sum of its proper divisors (4414325).

1002000019 is an equidigital number, since it uses as much as digits as its factorization.

1002000019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4414324.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1002000019 is about 31654.3838828052. The cubic root of 1002000019 is about 1000.6662290403. Note that the first 3 decimals are identical.

The spelling of 1002000019 in words is "one billion, two million, nineteen", and thus it is an aban number and an uban number.