2231291 has 4 divisors (see below), whose sum is σ = 2254392. Its totient is φ = 2208192.

The previous prime is 2231279. The next prime is 2231293. The reversal of 2231291 is 1921322.

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 2231291 - 2¹⁴ = 2214907 is a prime.

It is a super-3 number, since 3×2231291³ = 33326514581842725513, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2231293) 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, 11405 + ... + 11598.

It is an arithmetic number, because the mean of its divisors is an integer number (563598).

2^2231291 is an apocalyptic number.

2231291 is a deficient number, since it is larger than the sum of its proper divisors (23101).

2231291 is an equidigital number, since it uses as much as digits as its factorization.

2231291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23100.

The product of its digits is 216, while the sum is 20.

The square root of 2231291 is about 1493.7506485354. The cubic root of 2231291 is about 130.6728624312.

It can be divided in two parts, 22 and 31291, that added together give a palindrome (31313).

The spelling of 2231291 in words is "two million, two hundred thirty-one thousand, two hundred ninety-one".