1001020001 has 8 divisors (see below), whose sum is σ = 1008340224. Its totient is φ = 993714480.

The previous prime is 1001019991. The next prime is 1001020003. The reversal of 1001020001 is 1000201001.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1001020001 - 2⁶ = 1001019937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001020003) 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, 158435 + ... + 164631.

It is an arithmetic number, because the mean of its divisors is an integer number (126042528).

Almost surely, 2^1001020001 is an apocalyptic number.

It is an amenable number.

1001020001 is a deficient number, since it is larger than the sum of its proper divisors (7320223).

1001020001 is an equidigital number, since it uses as much as digits as its factorization.

1001020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7351.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 1001020001 is about 31638.9001231079. The cubic root of 1001020001 is about 1000.3398847986.

Adding to 1001020001 its reverse (1000201001), we get a palindrome (2001221002).

The spelling of 1001020001 in words is "one billion, one million, twenty thousand, one".