2001010001 has 2 divisors, whose sum is σ = 2001010002. Its totient is φ = 2001010000.

The previous prime is 2001009977. The next prime is 2001010009. The reversal of 2001010001 is 1000101002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1799795776 + 201214225 = 42424^2 + 14185^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001010001 - 2⁶ = 2001009937 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001010009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000505000 + 1000505001.

It is an arithmetic number, because the mean of its divisors is an integer number (1000505001).

Almost surely, 2^2001010001 is an apocalyptic number.

It is an amenable number.

2001010001 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001010001 is an equidigital number, since it uses as much as digits as its factorization.

2001010001 is an evil number, because the sum of its binary digits is even.

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

The square root of 2001010001 is about 44732.6502791865. The cubic root of 2001010001 is about 1260.1331011236.

Adding to 2001010001 its reverse (1000101002), we get a palindrome (3001111003).

The spelling of 2001010001 in words is "two billion, one million, ten thousand, one".