1031111320231 has 4 divisors (see below), whose sum is σ = 1056260376864. Its totient is φ = 1005962263600.

The previous prime is 1031111320189. The next prime is 1031111320237. The reversal of 1031111320231 is 1320231111301.

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 1031111320231 - 2¹⁵ = 1031111287463 is a prime.

It is a super-2 number, since 2×1031111320231² (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 = 1031111320199 and 1031111320208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031111320237) 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, 12574528255 + ... + 12574528336.

It is an arithmetic number, because the mean of its divisors is an integer number (264065094216).

Almost surely, 2^{1031111320231} is an apocalyptic number.

1031111320231 is a deficient number, since it is larger than the sum of its proper divisors (25149056633).

1031111320231 is an equidigital number, since it uses as much as digits as its factorization.

1031111320231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25149056632.

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

Adding to 1031111320231 its reverse (1320231111301), we get a palindrome (2351342431532).

The spelling of 1031111320231 in words is "one trillion, thirty-one billion, one hundred eleven million, three hundred twenty thousand, two hundred thirty-one".