1231201002001 has 4 divisors (see below), whose sum is σ = 1303624590372. Its totient is φ = 1158777413632.

The previous prime is 1231201001999. The next prime is 1231201002089. The reversal of 1231201002001 is 1002001021321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 736395678225 + 494805323776 = 858135^2 + 703424^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231201002001 - 2¹ = 1231201001999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231201002301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36211794160 + ... + 36211794193.

It is an arithmetic number, because the mean of its divisors is an integer number (325906147593).

Almost surely, 2^{1231201002001} is an apocalyptic number.

It is an amenable number.

1231201002001 is a deficient number, since it is larger than the sum of its proper divisors (72423588371).

1231201002001 is an equidigital number, since it uses as much as digits as its factorization.

1231201002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72423588370.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 1231201002001 its reverse (1002001021321), we get a palindrome (2233202023322).

The spelling of 1231201002001 in words is "one trillion, two hundred thirty-one billion, two hundred one million, two thousand, one".