1311201243203 has 4 divisors (see below), whose sum is σ = 1330771411080. Its totient is φ = 1291631075328.

The previous prime is 1311201243179. The next prime is 1311201243221. The reversal of 1311201243203 is 3023421021131.

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

It is a cyclic number.

It is not a de Polignac number, because 1311201243203 - 2⁶ = 1311201243139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311201243223) 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, 9785083838 + ... + 9785083971.

It is an arithmetic number, because the mean of its divisors is an integer number (332692852770).

Almost surely, 2^{1311201243203} is an apocalyptic number.

1311201243203 is a deficient number, since it is larger than the sum of its proper divisors (19570167877).

1311201243203 is an equidigital number, since it uses as much as digits as its factorization.

1311201243203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19570167876.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1311201243203 its reverse (3023421021131), we get a palindrome (4334622264334).

The spelling of 1311201243203 in words is "one trillion, three hundred eleven billion, two hundred one million, two hundred forty-three thousand, two hundred three".