1311103231 has 4 divisors (see below), whose sum is σ = 1311247672. Its totient is φ = 1310958792.

The previous prime is 1311103217. The next prime is 1311103259. The reversal of 1311103231 is 1323011131.

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 1311103231 - 2²¹ = 1309006079 is a prime.

It is a super-2 number, since 2×1311103231² = 3437983364677278722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311103831) 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, 57621 + ... + 77086.

It is an arithmetic number, because the mean of its divisors is an integer number (327811918).

Almost surely, 2^1311103231 is an apocalyptic number.

1311103231 is a deficient number, since it is larger than the sum of its proper divisors (144441).

1311103231 is an equidigital number, since it uses as much as digits as its factorization.

1311103231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144440.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1311103231 is about 36209.1594903831. The cubic root of 1311103231 is about 1094.4912549510.

Adding to 1311103231 its reverse (1323011131), we get a palindrome (2634114362).

The spelling of 1311103231 in words is "one billion, three hundred eleven million, one hundred three thousand, two hundred thirty-one".