1311123111 has 8 divisors (see below), whose sum is σ = 1751815680. Its totient is φ = 872256312.

The previous prime is 1311123091. The next prime is 1311123131. The reversal of 1311123111 is 1113211131.

It is an interprime number because it is at equal distance from previous prime (1311123091) and next prime (1311123131).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1311123111 - 2¹⁵ = 1311090343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311123131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454765 + ... + 457638.

It is an arithmetic number, because the mean of its divisors is an integer number (218976960).

Almost surely, 2^1311123111 is an apocalyptic number.

1311123111 is a deficient number, since it is larger than the sum of its proper divisors (440692569).

1311123111 is an equidigital number, since it uses as much as digits as its factorization.

1311123111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912885.

The product of its digits is 18, while the sum is 15.

The square root of 1311123111 is about 36209.4340055185. The cubic root of 1311123111 is about 1094.4967867748.

Adding to 1311123111 its reverse (1113211131), we get a palindrome (2424334242).

The spelling of 1311123111 in words is "one billion, three hundred eleven million, one hundred twenty-three thousand, one hundred eleven".