2481821 has 4 divisors (see below), whose sum is σ = 2504700. Its totient is φ = 2458944.

The previous prime is 2481811. The next prime is 2481823. The reversal of 2481821 is 1281842.

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 688900 + 1792921 = 830^2 + 1339^2 .

It is a cyclic number.

It is not a de Polignac number, because 2481821 - 2⁶ = 2481757 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 (2481823) 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, 11276 + ... + 11493.

It is an arithmetic number, because the mean of its divisors is an integer number (626175).

2^2481821 is an apocalyptic number.

It is an amenable number.

2481821 is a deficient number, since it is larger than the sum of its proper divisors (22879).

2481821 is a wasteful number, since it uses less digits than its factorization.

2481821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22878.

The product of its digits is 1024, while the sum is 26.

The square root of 2481821 is about 1575.3796367860. The cubic root of 2481821 is about 135.3911108960.

The spelling of 2481821 in words is "two million, four hundred eighty-one thousand, eight hundred twenty-one".