51420553 has 2 divisors, whose sum is σ = 51420554. Its totient is φ = 51420552.

The previous prime is 51420541. The next prime is 51420559. The reversal of 51420553 is 35502415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25887744 + 25532809 = 5088^2 + 5053^2 .

It is a cyclic number.

It is not a de Polignac number, because 51420553 - 2¹⁷ = 51289481 is a prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (51420559) 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, 25710276 + 25710277.

It is an arithmetic number, because the mean of its divisors is an integer number (25710277).

Almost surely, 2^51420553 is an apocalyptic number.

It is an amenable number.

51420553 is a deficient number, since it is larger than the sum of its proper divisors (1).

51420553 is an equidigital number, since it uses as much as digits as its factorization.

51420553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 51420553 is about 7170.8125759916. The cubic root of 51420553 is about 371.8595285139.

Adding to 51420553 its reverse (35502415), we get a palindrome (86922968).

The spelling of 51420553 in words is "fifty-one million, four hundred twenty thousand, five hundred fifty-three".