1002020001 has 32 divisors (see below), whose sum is σ = 1485796608. Its totient is φ = 597442560.

The previous prime is 1002019999. The next prime is 1002020009. The reversal of 1002020001 is 1000202001.

It is a happy number.

It is not a de Polignac number, because 1002020001 - 2¹ = 1002019999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1002020009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181441 + ... + 186881.

It is an arithmetic number, because the mean of its divisors is an integer number (46431144).

Almost surely, 2^1002020001 is an apocalyptic number.

It is an amenable number.

1002020001 is a deficient number, since it is larger than the sum of its proper divisors (483776607).

1002020001 is a wasteful number, since it uses less digits than its factorization.

1002020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5641.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1002020001 is about 31654.6995089197. The cubic root of 1002020001 is about 1000.6728807965.

Adding to 1002020001 its reverse (1000202001), we get a palindrome (2002222002).

It can be divided in two parts, 100202000 and 1, that added together give a palindrome (100202001).

The spelling of 1002020001 in words is "one billion, two million, twenty thousand, one".