4361821 has 2 divisors, whose sum is σ = 4361822. Its totient is φ = 4361820.

The previous prime is 4361813. The next prime is 4361837. The reversal of 4361821 is 1281634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3290596 + 1071225 = 1814^2 + 1035^2 .

It is a cyclic number.

It is not a de Polignac number, because 4361821 - 2³ = 4361813 is a prime.

4361821 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4362821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2180910 + 2180911.

It is an arithmetic number, because the mean of its divisors is an integer number (2180911).

Almost surely, 2^4361821 is an apocalyptic number.

It is an amenable number.

4361821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4361821 is an equidigital number, since it uses as much as digits as its factorization.

4361821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 25.

The square root of 4361821 is about 2088.4973066777. The cubic root of 4361821 is about 163.3889241104.

The spelling of 4361821 in words is "four million, three hundred sixty-one thousand, eight hundred twenty-one".