2281991 has 8 divisors (see below), whose sum is σ = 2433024. Its totient is φ = 2135320.

The previous prime is 2281987. The next prime is 2282017. The reversal of 2281991 is 1991822.

It is a happy number.

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

It is not a de Polignac number, because 2281991 - 2² = 2281987 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2281921) 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, 26 + ... + 2136.

It is an arithmetic number, because the mean of its divisors is an integer number (304128).

2^2281991 is an apocalyptic number.

2281991 is a deficient number, since it is larger than the sum of its proper divisors (151033).

2281991 is a wasteful number, since it uses less digits than its factorization.

2281991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181.

The product of its digits is 2592, while the sum is 32.

The square root of 2281991 is about 1510.6260291680. The cubic root of 2281991 is about 131.6551874484.

The spelling of 2281991 in words is "two million, two hundred eighty-one thousand, nine hundred ninety-one".