2321813 has 4 divisors (see below), whose sum is σ = 2500428. Its totient is φ = 2143200.

The previous prime is 2321791. The next prime is 2321821. The reversal of 2321813 is 3181232.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 268324 + 2053489 = 518^2 + 1433^2 .

It is a cyclic number.

It is not a de Polignac number, because 2321813 - 2⁶ = 2321749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2321863) 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, 89288 + ... + 89313.

It is an arithmetic number, because the mean of its divisors is an integer number (625107).

2^2321813 is an apocalyptic number.

It is an amenable number.

2321813 is a deficient number, since it is larger than the sum of its proper divisors (178615).

2321813 is a wasteful number, since it uses less digits than its factorization.

2321813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178614.

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

The square root of 2321813 is about 1523.7496513535. The cubic root of 2321813 is about 132.4165940021.

The spelling of 2321813 in words is "two million, three hundred twenty-one thousand, eight hundred thirteen".