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2001001001 = 4346534907
BaseRepresentation
bin111011101000100…
…1101101000101001
312011110020101100012
41313101031220221
513044224013001
6530320221305
7100405141106
oct16721155051
95143211305
102001001001
1193757073a
1247a16a835
1325b737b7c
1414da79aad
15baa0e2bb
hex7744da29

2001001001 has 4 divisors (see below), whose sum is σ = 2047535952. Its totient is φ = 1954466052.

The previous prime is 2001000977. The next prime is 2001001003. The reversal of 2001001001 is 1001001002.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 2001001001 - 214 = 2000984617 is a prime.

It is a Duffinian number.

2001001001 is a modest number, since divided by 1001001 gives 2 as remainder.

It is not an unprimeable number, because it can be changed into a prime (2001001003) 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, 23267411 + ... + 23267496.

It is an arithmetic number, because the mean of its divisors is an integer number (511883988).

Almost surely, 22001001001 is an apocalyptic number.

It is an amenable number.

2001001001 is a deficient number, since it is larger than the sum of its proper divisors (46534951).

2001001001 is an equidigital number, since it uses as much as digits as its factorization.

2001001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46534950.

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

The square root of 2001001001 is about 44732.5496814121. The cubic root of 2001001001 is about 1260.1312118752.

Adding to 2001001001 its reverse (1001001002), we get a palindrome (3002002003).

Subtracting from 2001001001 its reverse (1001001002), we obtain a palindrome (999999999).

The spelling of 2001001001 in words is "two billion, one million, one thousand, one".

Divisors: 1 43 46534907 2001001001