1005501001 has 4 divisors (see below), whose sum is σ = 1024472772. Its totient is φ = 986529232.

The previous prime is 1005500999. The next prime is 1005501017. The reversal of 1005501001 is 1001055001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1001055001 = 89 ⋅11247809.

It can be written as a sum of positive squares in 2 ways, for example, as 703575625 + 301925376 = 26525^2 + 17376^2 .

It is a cyclic number.

It is not a de Polignac number, because 1005501001 - 2¹ = 1005500999 is a prime.

It is a super-2 number, since 2×1005501001² = 2022064526024004002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1005501061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9485806 + ... + 9485911.

It is an arithmetic number, because the mean of its divisors is an integer number (256118193).

Almost surely, 2^1005501001 is an apocalyptic number.

It is an amenable number.

1005501001 is a deficient number, since it is larger than the sum of its proper divisors (18971771).

1005501001 is an equidigital number, since it uses as much as digits as its factorization.

1005501001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18971770.

The product of its (nonzero) digits is 25, while the sum is 13.

The square root of 1005501001 is about 31709.6357752655. The cubic root of 1005501001 is about 1001.8303149035.

Adding to 1005501001 its reverse (1001055001), we get a palindrome (2006556002).

The spelling of 1005501001 in words is "one billion, five million, five hundred one thousand, one".