51820553 has 2 divisors, whose sum is σ = 51820554. Its totient is φ = 51820552.

The previous prime is 51820529. The next prime is 51820577. The reversal of 51820553 is 35502815.

It is a balanced prime because it is at equal distance from previous prime (51820529) and next prime (51820577).

It can be written as a sum of positive squares in only one way, i.e., 45535504 + 6285049 = 6748^2 + 2507^2 .

It is a cyclic number.

It is not a de Polignac number, because 51820553 - 2⁸ = 51820297 is a prime.

It is not a weakly prime, because it can be changed into another prime (51820513) 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, 25910276 + 25910277.

It is an arithmetic number, because the mean of its divisors is an integer number (25910277).

Almost surely, 2^51820553 is an apocalyptic number.

It is an amenable number.

51820553 is a deficient number, since it is larger than the sum of its proper divisors (1).

51820553 is an equidigital number, since it uses as much as digits as its factorization.

51820553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 51820553 is about 7198.6493872115. The cubic root of 51820553 is about 372.8212696125.

The spelling of 51820553 in words is "fifty-one million, eight hundred twenty thousand, five hundred fifty-three".