1311191211 has 12 divisors (see below), whose sum is σ = 1921636136. Its totient is φ = 794661120.

The previous prime is 1311191207. The next prime is 1311191251. The reversal of 1311191211 is 1121911131.

It is not a de Polignac number, because 1311191211 - 2² = 1311191207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311191251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1805686 + ... + 1806411.

Almost surely, 2^1311191211 is an apocalyptic number.

1311191211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1311191211 is a deficient number, since it is larger than the sum of its proper divisors (610444925).

1311191211 is a wasteful number, since it uses less digits than its factorization.

1311191211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3612122 (or 3612111 counting only the distinct ones).

The product of its digits is 54, while the sum is 21.

The square root of 1311191211 is about 36210.3743559770. The cubic root of 1311191211 is about 1094.5157359084.

The spelling of 1311191211 in words is "one billion, three hundred eleven million, one hundred ninety-one thousand, two hundred eleven".