51561203 has 2 divisors, whose sum is σ = 51561204. Its totient is φ = 51561202.

The previous prime is 51561199. The next prime is 51561233. The reversal of 51561203 is 30216515.

51561203 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51561203 - 2² = 51561199 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51561233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25780601 + 25780602.

It is an arithmetic number, because the mean of its divisors is an integer number (25780602).

Almost surely, 2^51561203 is an apocalyptic number.

51561203 is a deficient number, since it is larger than the sum of its proper divisors (1).

51561203 is an equidigital number, since it uses as much as digits as its factorization.

51561203 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 51561203 is about 7180.6129961167. The cubic root of 51561203 is about 372.1982674352.

Adding to 51561203 its reverse (30216515), we get a palindrome (81777718).

The spelling of 51561203 in words is "fifty-one million, five hundred sixty-one thousand, two hundred three".