2231091 has 8 divisors (see below), whose sum is σ = 3305360. Its totient is φ = 1487376.

The previous prime is 2231087. The next prime is 2231093. The reversal of 2231091 is 1901322.

It is a happy number.

It is not a de Polignac number, because 2231091 - 2² = 2231087 is a prime.

It is a super-3 number, since 3×2231091³ = 33317553797935459713, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41290 + ... + 41343.

It is an arithmetic number, because the mean of its divisors is an integer number (413170).

2^2231091 is an apocalyptic number.

2231091 is a deficient number, since it is larger than the sum of its proper divisors (1074269).

2231091 is an equidigital number, since it uses as much as digits as its factorization.

2231091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82642 (or 82636 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 2231091 is about 1493.6837014576. The cubic root of 2231091 is about 130.6689580618.

It can be divided in two parts, 22 and 31091, that added together give a palindrome (31113).

The spelling of 2231091 in words is "two million, two hundred thirty-one thousand, ninety-one".