1001005500 has 384 divisors, whose sum is σ = 3488808960. Its totient is φ = 220320000.

The previous prime is 1001005459. The next prime is 1001005549. The reversal of 1001005500 is 55001001.

It is a super-2 number, since 2×1001005500² = 2004024022060500000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9718449 + ... + 9718551.

It is an arithmetic number, because the mean of its divisors is an integer number (9085440).

Almost surely, 2^1001005500 is an apocalyptic number.

1001005500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1001005500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1744404480).

1001005500 is an abundant number, since it is smaller than the sum of its proper divisors (2487803460).

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

1001005500 is a wasteful number, since it uses less digits than its factorization.

1001005500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 25, while the sum is 12.

The square root of 1001005500 is about 31638.6709581803. The cubic root of 1001005500 is about 1000.3350543927.

Adding to 1001005500 its reverse (55001001), we get a palindrome (1056006501).

The spelling of 1001005500 in words is "one billion, one million, five thousand, five hundred".