2381321 has 6 divisors (see below), whose sum is σ = 2449566. Its totient is φ = 2313600.

The previous prime is 2381317. The next prime is 2381329. The reversal of 2381321 is 1231832.

It can be written as a sum of positive squares in 3 ways, for example, as 319225 + 2062096 = 565^2 + 1436^2 .

It is not a de Polignac number, because 2381321 - 2² = 2381317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2381293 and 2381302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2381329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9761 + ... + 10001.

It is an arithmetic number, because the mean of its divisors is an integer number (408261).

2^2381321 is an apocalyptic number.

It is an amenable number.

2381321 is a deficient number, since it is larger than the sum of its proper divisors (68245).

2381321 is an frugal number, since it uses more digits than its factorization.

2381321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523 (or 282 counting only the distinct ones).

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

The square root of 2381321 is about 1543.1529412213. The cubic root of 2381321 is about 133.5383422624.

The spelling of 2381321 in words is "two million, three hundred eighty-one thousand, three hundred twenty-one".