11745821 has 2 divisors, whose sum is σ = 11745822. Its totient is φ = 11745820.

The previous prime is 11745809. The next prime is 11745823. The reversal of 11745821 is 12854711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10272025 + 1473796 = 3205^2 + 1214^2 .

It is an emirp because it is prime and its reverse (12854711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11745821 - 2⁶ = 11745757 is a prime.

Together with 11745823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11745823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5872910 + 5872911.

It is an arithmetic number, because the mean of its divisors is an integer number (5872911).

Almost surely, 2^11745821 is an apocalyptic number.

It is an amenable number.

11745821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11745821 is an equidigital number, since it uses as much as digits as its factorization.

11745821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 29.

The square root of 11745821 is about 3427.2176761916. The cubic root of 11745821 is about 227.3148418973.

The spelling of 11745821 in words is "eleven million, seven hundred forty-five thousand, eight hundred twenty-one".