1031111321331 has 32 divisors (see below), whose sum is σ = 1694172049920. Its totient is φ = 543210488064.

The previous prime is 1031111321321. The next prime is 1031111321351. The reversal of 1031111321331 is 1331231111301.

It is not a de Polignac number, because 1031111321331 - 2¹⁰ = 1031111320307 is a prime.

It is a super-2 number, since 2×1031111321331² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1031111321298 and 1031111321307.

It is not an unprimeable number, because it can be changed into a prime (1031111321321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2113485 + ... + 2555198.

It is an arithmetic number, because the mean of its divisors is an integer number (52942876560).

Almost surely, 2^{1031111321331} is an apocalyptic number.

1031111321331 is a deficient number, since it is larger than the sum of its proper divisors (663060728589).

1031111321331 is a wasteful number, since it uses less digits than its factorization.

1031111321331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4669515.

The product of its (nonzero) digits is 162, while the sum is 21.

Adding to 1031111321331 its reverse (1331231111301), we get a palindrome (2362342432632).

The spelling of 1031111321331 in words is "one trillion, thirty-one billion, one hundred eleven million, three hundred twenty-one thousand, three hundred thirty-one".