2001231143251 has 2 divisors, whose sum is σ = 2001231143252. Its totient is φ = 2001231143250.

The previous prime is 2001231143243. The next prime is 2001231143257. The reversal of 2001231143251 is 1523411321002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2001231143251 - 2³ = 2001231143243 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001231143257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000615571625 + 1000615571626.

It is an arithmetic number, because the mean of its divisors is an integer number (1000615571626).

Almost surely, 2^{2001231143251} is an apocalyptic number.

2001231143251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001231143251 is an equidigital number, since it uses as much as digits as its factorization.

2001231143251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 2001231143251 its reverse (1523411321002), we get a palindrome (3524642464253).

The spelling of 2001231143251 in words is "two trillion, one billion, two hundred thirty-one million, one hundred forty-three thousand, two hundred fifty-one".