51563021 has 2 divisors, whose sum is σ = 51563022. Its totient is φ = 51563020.

The previous prime is 51563009. The next prime is 51563047. The reversal of 51563021 is 12036515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38502025 + 13060996 = 6205^2 + 3614^2 .

It is a cyclic number.

It is not a de Polignac number, because 51563021 - 2¹⁰ = 51561997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51563081) 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, 25781510 + 25781511.

It is an arithmetic number, because the mean of its divisors is an integer number (25781511).

Almost surely, 2^51563021 is an apocalyptic number.

It is an amenable number.

51563021 is a deficient number, since it is larger than the sum of its proper divisors (1).

51563021 is an equidigital number, since it uses as much as digits as its factorization.

51563021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 51563021 is about 7180.7395858644. The cubic root of 51563021 is about 372.2026418386.

Adding to 51563021 its reverse (12036515), we get a palindrome (63599536).

It can be divided in two parts, 515 and 63021, that added together give a palindrome (63536).

The spelling of 51563021 in words is "fifty-one million, five hundred sixty-three thousand, twenty-one".