1006521001 has 4 divisors (see below), whose sum is σ = 1006729812. Its totient is φ = 1006312192.

The previous prime is 1006520993. The next prime is 1006521017. The reversal of 1006521001 is 1001256001.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 576000000 + 430521001 = 24000^2 + 20749^2 .

It is a cyclic number.

It is not a de Polignac number, because 1006521001 - 2³ = 1006520993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1006521071) 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, 97000 + ... + 106873.

It is an arithmetic number, because the mean of its divisors is an integer number (251682453).

Almost surely, 2^1006521001 is an apocalyptic number.

It is an amenable number.

1006521001 is a deficient number, since it is larger than the sum of its proper divisors (208811).

1006521001 is an equidigital number, since it uses as much as digits as its factorization.

1006521001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208810.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1006521001 is about 31725.7151377238. The cubic root of 1006521001 is about 1002.1689592147.

Adding to 1006521001 its reverse (1001256001), we get a palindrome (2007777002).

The spelling of 1006521001 in words is "one billion, six million, five hundred twenty-one thousand, one".