1020203001 has 6 divisors (see below), whose sum is σ = 1473626570. Its totient is φ = 680135328.

The previous prime is 1020202957. The next prime is 1020203003. The reversal of 1020203001 is 1003020201.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 874976400 + 145226601 = 29580^2 + 12051^2 .

It is not a de Polignac number, because 1020203001 - 2⁷ = 1020202873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 113355889 = 1020203001 / (1 + 0 + 2 + 0 + 2 + 0 + 3 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020203003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56677936 + ... + 56677953.

Almost surely, 2^1020203001 is an apocalyptic number.

It is an amenable number.

1020203001 is a deficient number, since it is larger than the sum of its proper divisors (453423569).

1020203001 is a wasteful number, since it uses less digits than its factorization.

1020203001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113355895 (or 113355892 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1020203001 is about 31940.6167911642. The cubic root of 1020203001 is about 1006.6894846784.

Adding to 1020203001 its reverse (1003020201), we get a palindrome (2023223202).

The spelling of 1020203001 in words is "one billion, twenty million, two hundred three thousand, one".