2231831 has 4 divisors (see below), whose sum is σ = 2550672. Its totient is φ = 1912992.

The previous prime is 2231821. The next prime is 2231833. The reversal of 2231831 is 1381322.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1381322 = 2 ⋅690661.

It is a cyclic number.

It is not a de Polignac number, because 2231831 - 2⁶ = 2231767 is a prime.

It is a super-3 number, since 3×2231831³ = 33350716723414887573, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231833) 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, 159410 + ... + 159423.

It is an arithmetic number, because the mean of its divisors is an integer number (637668).

2^2231831 is an apocalyptic number.

2231831 is a deficient number, since it is larger than the sum of its proper divisors (318841).

2231831 is an equidigital number, since it uses as much as digits as its factorization.

2231831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318840.

The product of its digits is 288, while the sum is 20.

The square root of 2231831 is about 1493.9313906602. The cubic root of 2231831 is about 130.6834030636.

The spelling of 2231831 in words is "two million, two hundred thirty-one thousand, eight hundred thirty-one".