1311605331011 has 4 divisors (see below), whose sum is σ = 1312593731232. Its totient is φ = 1310616930792.

The previous prime is 1311605330993. The next prime is 1311605331019. The reversal of 1311605331011 is 1101335061131.

It is a happy number.

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 1311605331011 - 2⁶ = 1311605330947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311605331019) 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, 494198120 + ... + 494200773.

It is an arithmetic number, because the mean of its divisors is an integer number (328148432808).

Almost surely, 2^{1311605331011} is an apocalyptic number.

1311605331011 is a deficient number, since it is larger than the sum of its proper divisors (988400221).

1311605331011 is an equidigital number, since it uses as much as digits as its factorization.

1311605331011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988400220.

The product of its (nonzero) digits is 810, while the sum is 26.

The spelling of 1311605331011 in words is "one trillion, three hundred eleven billion, six hundred five million, three hundred thirty-one thousand, eleven".