1031320211111 has 4 divisors (see below), whose sum is σ = 1032178930224. Its totient is φ = 1030461492000.

The previous prime is 1031320211093. The next prime is 1031320211171. The reversal of 1031320211111 is 1111120231301.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1031320211111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1031320211111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031320211171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429357755 + ... + 429360156.

It is an arithmetic number, because the mean of its divisors is an integer number (258044732556).

Almost surely, 2^{1031320211111} is an apocalyptic number.

1031320211111 is a deficient number, since it is larger than the sum of its proper divisors (858719113).

1031320211111 is an equidigital number, since it uses as much as digits as its factorization.

1031320211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858719112.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 1031320211111 its reverse (1111120231301), we get a palindrome (2142440442412).

The spelling of 1031320211111 in words is "one trillion, thirty-one billion, three hundred twenty million, two hundred eleven thousand, one hundred eleven".