51565061 has 2 divisors, whose sum is σ = 51565062. Its totient is φ = 51565060.

The previous prime is 51565051. The next prime is 51565081. The reversal of 51565061 is 16056515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47541025 + 4024036 = 6895^2 + 2006^2 .

It is a cyclic number.

It is not a de Polignac number, because 51565061 - 2¹⁸ = 51302917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51565001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25782530 + 25782531.

It is an arithmetic number, because the mean of its divisors is an integer number (25782531).

Almost surely, 2^51565061 is an apocalyptic number.

It is an amenable number.

51565061 is a deficient number, since it is larger than the sum of its proper divisors (1).

51565061 is an equidigital number, since it uses as much as digits as its factorization.

51565061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 51565061 is about 7180.8816311091. The cubic root of 51565061 is about 372.2075502876.

The spelling of 51565061 in words is "fifty-one million, five hundred sixty-five thousand, sixty-one".