2001230312009 has 2 divisors, whose sum is σ = 2001230312010. Its totient is φ = 2001230312008.

The previous prime is 2001230311987. The next prime is 2001230312063. The reversal of 2001230312009 is 9002130321002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1558202958400 + 443027353609 = 1248280^2 + 665603^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001230312009 - 2¹² = 2001230307913 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001230312909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000615156004 + 1000615156005.

It is an arithmetic number, because the mean of its divisors is an integer number (1000615156005).

Almost surely, 2^{2001230312009} is an apocalyptic number.

It is an amenable number.

2001230312009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001230312009 is an equidigital number, since it uses as much as digits as its factorization.

2001230312009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The spelling of 2001230312009 in words is "two trillion, one billion, two hundred thirty million, three hundred twelve thousand, nine".