51561359 has 2 divisors, whose sum is σ = 51561360. Its totient is φ = 51561358.

The previous prime is 51561353. The next prime is 51561361. The reversal of 51561359 is 95316515.

It is a happy number.

51561359 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51561359 - 2²⁴ = 34784143 is a prime.

Together with 51561361, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_3089087 and since 51561359 and 3089087 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51561353) 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, 25780679 + 25780680.

It is an arithmetic number, because the mean of its divisors is an integer number (25780680).

Almost surely, 2^51561359 is an apocalyptic number.

51561359 is a deficient number, since it is larger than the sum of its proper divisors (1).

51561359 is an equidigital number, since it uses as much as digits as its factorization.

51561359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20250, while the sum is 35.

The square root of 51561359 is about 7180.6238586908. The cubic root of 51561359 is about 372.1986428006.

The spelling of 51561359 in words is "fifty-one million, five hundred sixty-one thousand, three hundred fifty-nine".