53859821 has 2 divisors, whose sum is σ = 53859822. Its totient is φ = 53859820.

The previous prime is 53859797. The next prime is 53859823. The reversal of 53859821 is 12895835.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52562500 + 1297321 = 7250^2 + 1139^2 .

It is a cyclic number.

It is not a de Polignac number, because 53859821 - 2¹⁰ = 53858797 is a prime.

It is a Sophie Germain prime.

Together with 53859823, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53859823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26929910 + 26929911.

It is an arithmetic number, because the mean of its divisors is an integer number (26929911).

Almost surely, 2^53859821 is an apocalyptic number.

It is an amenable number.

53859821 is a deficient number, since it is larger than the sum of its proper divisors (1).

53859821 is an equidigital number, since it uses as much as digits as its factorization.

53859821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 41.

The square root of 53859821 is about 7338.9250575272. The cubic root of 53859821 is about 377.6489677118.

The spelling of 53859821 in words is "fifty-three million, eight hundred fifty-nine thousand, eight hundred twenty-one".