1231311320011 has 8 divisors (see below), whose sum is σ = 1260123516080. Its totient is φ = 1202507171712.

The previous prime is 1231311319937. The next prime is 1231311320023. The reversal of 1231311320011 is 1100231131321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231311320011 - 2¹¹ = 1231311317963 is a prime.

It is a super-2 number, since 2×1231311320011² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231311320311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1701810 + ... + 2314903.

It is an arithmetic number, because the mean of its divisors is an integer number (157515439510).

Almost surely, 2^{1231311320011} is an apocalyptic number.

1231311320011 is a deficient number, since it is larger than the sum of its proper divisors (28812196069).

1231311320011 is an equidigital number, since it uses as much as digits as its factorization.

1231311320011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4023885.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 1231311320011 its reverse (1100231131321), we get a palindrome (2331542451332).

The spelling of 1231311320011 in words is "one trillion, two hundred thirty-one billion, three hundred eleven million, three hundred twenty thousand, eleven".