1311102011 has 4 divisors (see below), whose sum is σ = 1380107400. Its totient is φ = 1242096624.

The previous prime is 1311101983. The next prime is 1311102017. The reversal of 1311102011 is 1102011131.

It is a happy number.

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-1311102011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311101983 and 1311102001.

It is not an unprimeable number, because it can be changed into a prime (1311102017) 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, 34502666 + ... + 34502703.

It is an arithmetic number, because the mean of its divisors is an integer number (345026850).

Almost surely, 2^1311102011 is an apocalyptic number.

1311102011 is a deficient number, since it is larger than the sum of its proper divisors (69005389).

1311102011 is an equidigital number, since it uses as much as digits as its factorization.

1311102011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69005388.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 1311102011 is about 36209.1426438130. The cubic root of 1311102011 is about 1094.4909154711.

Adding to 1311102011 its reverse (1102011131), we get a palindrome (2413113142).

It can be divided in two parts, 131 and 1102011, that multiplied together give a palindrome (144363441).

The spelling of 1311102011 in words is "one billion, three hundred eleven million, one hundred two thousand, eleven".