5661823 has 2 divisors, whose sum is σ = 5661824. Its totient is φ = 5661822.

The previous prime is 5661811. The next prime is 5661839. The reversal of 5661823 is 3281665.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5661823 - 2⁹ = 5661311 is a prime.

5661823 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5661893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830911 + 2830912.

It is an arithmetic number, because the mean of its divisors is an integer number (2830912).

Almost surely, 2^5661823 is an apocalyptic number.

5661823 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661823 is an equidigital number, since it uses as much as digits as its factorization.

5661823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 5661823 is about 2379.4585518559. The cubic root of 5661823 is about 178.2318969726.

The spelling of 5661823 in words is "five million, six hundred sixty-one thousand, eight hundred twenty-three".