1001001008 has 60 divisors (see below), whose sum is σ = 2276249400. Its totient is φ = 425166336.

The previous prime is 1001000989. The next prime is 1001001011. The reversal of 1001001008 is 8001001001.

It is a self number, because there is not a number n which added to its sum of digits gives 1001001008.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82943 + ... + 94241.

It is an arithmetic number, because the mean of its divisors is an integer number (37937490).

Almost surely, 2^1001001008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1001001008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1138124700).

1001001008 is an abundant number, since it is smaller than the sum of its proper divisors (1275248392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1001001008 is a wasteful number, since it uses less digits than its factorization.

1001001008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11434 (or 11421 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1001001008 is about 31638.5999690252. The cubic root of 1001001008 is about 1000.3335580600. Note that the first 3 decimals are identical.

Adding to 1001001008 its reverse (8001001001), we get a palindrome (9002002009).

The spelling of 1001001008 in words is "one billion, one million, one thousand, eight".