51565361 has 2 divisors, whose sum is σ = 51565362. Its totient is φ = 51565360.

The previous prime is 51565357. The next prime is 51565387. The reversal of 51565361 is 16356515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44302336 + 7263025 = 6656^2 + 2695^2 .

It is a cyclic number.

It is not a de Polignac number, because 51565361 - 2² = 51565357 is a prime.

It is a Chen prime.

It is equal to p_3089336 and since 51565361 and 3089336 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (51565321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25782680 + 25782681.

It is an arithmetic number, because the mean of its divisors is an integer number (25782681).

Almost surely, 2^51565361 is an apocalyptic number.

It is an amenable number.

51565361 is a deficient number, since it is larger than the sum of its proper divisors (1).

51565361 is an equidigital number, since it uses as much as digits as its factorization.

51565361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13500, while the sum is 32.

The square root of 51565361 is about 7180.9025198787. The cubic root of 51565361 is about 372.2082721074.

The spelling of 51565361 in words is "fifty-one million, five hundred sixty-five thousand, three hundred sixty-one".