1020002001 has 8 divisors (see below), whose sum is σ = 1365059520. Its totient is φ = 677472912.

The previous prime is 1020001991. The next prime is 1020002017. The reversal of 1020002001 is 1002000201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1020002001 - 2⁶ = 1020001937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1020002041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 631165 + ... + 632778.

It is an arithmetic number, because the mean of its divisors is an integer number (170632440).

Almost surely, 2^1020002001 is an apocalyptic number.

It is an amenable number.

1020002001 is a deficient number, since it is larger than the sum of its proper divisors (345057519).

1020002001 is a wasteful number, since it uses less digits than its factorization.

1020002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264215.

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

The square root of 1020002001 is about 31937.4701721974. The cubic root of 1020002001 is about 1006.6233678120.

Adding to 1020002001 its reverse (1002000201), we get a palindrome (2022002202).

It can be divided in two parts, 102000200 and 1, that added together give a palindrome (102000201).

The spelling of 1020002001 in words is "one billion, twenty million, two thousand, one".