1020201001 has 4 divisors (see below), whose sum is σ = 1020638032. Its totient is φ = 1019763972.

The previous prime is 1020200999. The next prime is 1020201019. The reversal of 1020201001 is 1001020201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1001020201 = 7577 ⋅132113.

It is a cyclic number.

It is not a de Polignac number, because 1020201001 - 2¹ = 1020200999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020201031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214995 + ... + 219688.

It is an arithmetic number, because the mean of its divisors is an integer number (255159508).

Almost surely, 2^1020201001 is an apocalyptic number.

It is an amenable number.

1020201001 is a deficient number, since it is larger than the sum of its proper divisors (437031).

1020201001 is an equidigital number, since it uses as much as digits as its factorization.

1020201001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437030.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1020201001 is about 31940.5854830496. The cubic root of 1020201001 is about 1006.6888268419.

Adding to 1020201001 its reverse (1001020201), we get a palindrome (2021221202).

The spelling of 1020201001 in words is "one billion, twenty million, two hundred one thousand, one".