1311031020231 has 20 divisors (see below), whose sum is σ = 1958609624400. Its totient is φ = 873951114816.

The previous prime is 1311031020203. The next prime is 1311031020289. The reversal of 1311031020231 is 1320201301131.

1311031020231 is a `hidden beast` number, since 1 + 311 + 0 + 310 + 20 + 23 + 1 = 666.

It is not a de Polignac number, because 1311031020231 - 2¹¹ = 1311031018183 is a prime.

It is a super-2 number, since 2×1311031020231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311031024231) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 390030 + ... + 1665588.

It is an arithmetic number, because the mean of its divisors is an integer number (97930481220).

Almost surely, 2^{1311031020231} is an apocalyptic number.

1311031020231 is a deficient number, since it is larger than the sum of its proper divisors (647578604169).

1311031020231 is a wasteful number, since it uses less digits than its factorization.

1311031020231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288260 (or 1288251 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 1311031020231 its reverse (1320201301131), we get a palindrome (2631232321362).

The spelling of 1311031020231 in words is "one trillion, three hundred eleven billion, thirty-one million, twenty thousand, two hundred thirty-one".