2231581 has 8 divisors (see below), whose sum is σ = 2500704. Its totient is φ = 1973520.

The previous prime is 2231533. The next prime is 2231587. The reversal of 2231581 is 1851322.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2231581 is a prime.

It is a super-3 number, since 3×2231581³ = 33339510572144687823, 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 (2231587) 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, 2335 + ... + 3148.

It is an arithmetic number, because the mean of its divisors is an integer number (312588).

2^2231581 is an apocalyptic number.

It is an amenable number.

2231581 is a deficient number, since it is larger than the sum of its proper divisors (269123).

2231581 is a wasteful number, since it uses less digits than its factorization.

2231581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5531.

The product of its digits is 480, while the sum is 22.

The square root of 2231581 is about 1493.8477164691. The cubic root of 2231581 is about 130.6785233526.

The spelling of 2231581 in words is "two million, two hundred thirty-one thousand, five hundred eighty-one".