1020202001 has 12 divisors (see below), whose sum is σ = 1278056052. Its totient is φ = 807192288.

The previous prime is 1020201989. The next prime is 1020202009. The reversal of 1020202001 is 1002020201.

It can be written as a sum of positive squares in 2 ways, for example, as 230310976 + 789891025 = 15176^2 + 28105^2 .

It is not a de Polignac number, because 1020202001 - 2¹⁰ = 1020200977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1020202001.

It is not an unprimeable number, because it can be changed into a prime (1020202009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 800150 + ... + 801423.

It is an arithmetic number, because the mean of its divisors is an integer number (106504671).

Almost surely, 2^1020202001 is an apocalyptic number.

It is an amenable number.

1020202001 is a deficient number, since it is larger than the sum of its proper divisors (257854051).

1020202001 is a wasteful number, since it uses less digits than its factorization.

1020202001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601600 (or 1601593 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1020202001 is about 31940.6011371107. The cubic root of 1020202001 is about 1006.6891557602.

Adding to 1020202001 its reverse (1002020201), we get a palindrome (2022222202).

It can be divided in two parts, 102020200 and 1, that added together give a palindrome (102020201).

The spelling of 1020202001 in words is "one billion, twenty million, two hundred two thousand, one".