2231311 has 2 divisors, whose sum is σ = 2231312. Its totient is φ = 2231310.

The previous prime is 2231309. The next prime is 2231329. The reversal of 2231311 is 1131322.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2231311 - 2¹ = 2231309 is a prime.

It is a super-3 number, since 3×2231311³ = 33327410748590199693, which contains 333 as substring.

Together with 2231309, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2231291 and 2231300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2231351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115655 + 1115656.

It is an arithmetic number, because the mean of its divisors is an integer number (1115656).

2^2231311 is an apocalyptic number.

2231311 is a deficient number, since it is larger than the sum of its proper divisors (1).

2231311 is an equidigital number, since it uses as much as digits as its factorization.

2231311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 13.

The square root of 2231311 is about 1493.7573430782. The cubic root of 2231311 is about 130.6732528554.

Adding to 2231311 its reverse (1131322), we get a palindrome (3362633).

The spelling of 2231311 in words is "two million, two hundred thirty-one thousand, three hundred eleven".