1311023113031 has 4 divisors (see below), whose sum is σ = 1311277834152. Its totient is φ = 1310768391912.

The previous prime is 1311023113027. The next prime is 1311023113073. The reversal of 1311023113031 is 1303113201131.

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 1311023113031 - 2² = 1311023113027 is a prime.

It is a super-2 number, since 2×1311023113031² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311023112994 and 1311023113012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311023113021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127352840 + ... + 127363133.

It is an arithmetic number, because the mean of its divisors is an integer number (327819458538).

Almost surely, 2^{1311023113031} is an apocalyptic number.

1311023113031 is a deficient number, since it is larger than the sum of its proper divisors (254721121).

1311023113031 is an equidigital number, since it uses as much as digits as its factorization.

1311023113031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254721120.

The product of its (nonzero) digits is 162, while the sum is 20.

Adding to 1311023113031 its reverse (1303113201131), we get a palindrome (2614136314162).

The spelling of 1311023113031 in words is "one trillion, three hundred eleven billion, twenty-three million, one hundred thirteen thousand, thirty-one".