53451821 has 2 divisors, whose sum is σ = 53451822. Its totient is φ = 53451820.

The previous prime is 53451809. The next prime is 53451829. The reversal of 53451821 is 12815435.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53085796 + 366025 = 7286^2 + 605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53451821 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53451829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26725910 + 26725911.

It is an arithmetic number, because the mean of its divisors is an integer number (26725911).

Almost surely, 2^53451821 is an apocalyptic number.

It is an amenable number.

53451821 is a deficient number, since it is larger than the sum of its proper divisors (1).

53451821 is an equidigital number, since it uses as much as digits as its factorization.

53451821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 29.

The square root of 53451821 is about 7311.0752287198. The cubic root of 53451821 is about 376.6929582852.

The spelling of 53451821 in words is "fifty-three million, four hundred fifty-one thousand, eight hundred twenty-one".