1311233345501 has 2 divisors, whose sum is σ = 1311233345502. Its totient is φ = 1311233345500.

The previous prime is 1311233345497. The next prime is 1311233345531. The reversal of 1311233345501 is 1055433321131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1310049641476 + 1183704025 = 1144574^2 + 34405^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311233345501 - 2² = 1311233345497 is a prime.

It is a super-3 number, since 3×1311233345501³ (a number of 37 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311233345531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655616672750 + 655616672751.

It is an arithmetic number, because the mean of its divisors is an integer number (655616672751).

Almost surely, 2^{1311233345501} is an apocalyptic number.

It is an amenable number.

1311233345501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311233345501 is an equidigital number, since it uses as much as digits as its factorization.

1311233345501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 32.

Adding to 1311233345501 its reverse (1055433321131), we get a palindrome (2366666666632).

The spelling of 1311233345501 in words is "one trillion, three hundred eleven billion, two hundred thirty-three million, three hundred forty-five thousand, five hundred one".