1020001 has 2 divisors, whose sum is σ = 1020002. Its totient is φ = 1020000.

The previous prime is 1019971. The next prime is 1020007. The reversal of 1020001 is 1000201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 904401 + 115600 = 951^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020001 - 2⁷ = 1019873 is a prime.

It is a super-3 number, since 3×1020001³ = 3183633363609180003, which contains 333 as substring.

1020001 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1020007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510000 + 510001.

It is an arithmetic number, because the mean of its divisors is an integer number (510001).

2^1020001 is an apocalyptic number.

It is an amenable number.

1020001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020001 is an equidigital number, since it uses as much as digits as its factorization.

1020001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2, while the sum is 4.

The square root of 1020001 is about 1009.9509889099. The cubic root of 1020001 is about 100.6623038522.

Adding to 1020001 its reverse (1000201), we get a palindrome (2020202).

Multiplying 1020001 by its reverse (1000201), we get a palindrome (1020206020201).

The spelling of 1020001 in words is "one million, twenty thousand, one".