2311391 has 4 divisors (see below), whose sum is σ = 2385984. Its totient is φ = 2236800.

The previous prime is 2311381. The next prime is 2311409. The reversal of 2311391 is 1931132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2311391 - 2¹⁰ = 2310367 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311321) 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, 37250 + ... + 37311.

It is an arithmetic number, because the mean of its divisors is an integer number (596496).

2^2311391 is an apocalyptic number.

2311391 is a deficient number, since it is larger than the sum of its proper divisors (74593).

2311391 is an equidigital number, since it uses as much as digits as its factorization.

2311391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74592.

The product of its digits is 162, while the sum is 20.

The square root of 2311391 is about 1520.3259518932. The cubic root of 2311391 is about 132.2181692089.

The spelling of 2311391 in words is "two million, three hundred eleven thousand, three hundred ninety-one".