51561353 has 2 divisors, whose sum is σ = 51561354. Its totient is φ = 51561352.

The previous prime is 51561329. The next prime is 51561359. The reversal of 51561353 is 35316515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49168144 + 2393209 = 7012^2 + 1547^2 .

It is a cyclic number.

It is not a de Polignac number, because 51561353 - 2¹² = 51557257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51561359) 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, 25780676 + 25780677.

It is an arithmetic number, because the mean of its divisors is an integer number (25780677).

Almost surely, 2^51561353 is an apocalyptic number.

It is an amenable number.

51561353 is a deficient number, since it is larger than the sum of its proper divisors (1).

51561353 is an equidigital number, since it uses as much as digits as its factorization.

51561353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6750, while the sum is 29.

The square root of 51561353 is about 7180.6234408998. The cubic root of 51561353 is about 372.1986283635.

Adding to 51561353 its reverse (35316515), we get a palindrome (86877868).

The spelling of 51561353 in words is "fifty-one million, five hundred sixty-one thousand, three hundred fifty-three".