2191311 has 6 divisors (see below), whose sum is σ = 3165240. Its totient is φ = 1460868.

The previous prime is 2191291. The next prime is 2191331. The reversal of 2191311 is 1131912.

It is an interprime number because it is at equal distance from previous prime (2191291) and next prime (2191331).

It is not a de Polignac number, because 2191311 - 2⁶ = 2191247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 121731 + ... + 121748.

It is an arithmetic number, because the mean of its divisors is an integer number (527540).

2^2191311 is an apocalyptic number.

2191311 is a deficient number, since it is larger than the sum of its proper divisors (973929).

2191311 is a wasteful number, since it uses less digits than its factorization.

2191311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243485 (or 243482 counting only the distinct ones).

The product of its digits is 54, while the sum is 18.

The square root of 2191311 is about 1480.3077382761. The cubic root of 2191311 is about 129.8876939346.

The spelling of 2191311 in words is "two million, one hundred ninety-one thousand, three hundred eleven".