1311203201001 has 4 divisors (see below), whose sum is σ = 1748270934672. Its totient is φ = 874135467332.

The previous prime is 1311203200997. The next prime is 1311203201041. The reversal of 1311203201001 is 1001023021131.

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 1311203201001 - 2² = 1311203200997 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1311203201041) 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, 218533866831 + ... + 218533866836.

It is an arithmetic number, because the mean of its divisors is an integer number (437067733668).

Almost surely, 2^{1311203201001} is an apocalyptic number.

It is an amenable number.

1311203201001 is a deficient number, since it is larger than the sum of its proper divisors (437067733671).

1311203201001 is an equidigital number, since it uses as much as digits as its factorization.

1311203201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437067733670.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 1311203201001 its reverse (1001023021131), we get a palindrome (2312226222132).

The spelling of 1311203201001 in words is "one trillion, three hundred eleven billion, two hundred three million, two hundred one thousand, one".