51810361 has 2 divisors, whose sum is σ = 51810362. Its totient is φ = 51810360.

The previous prime is 51810349. The next prime is 51810377. The reversal of 51810361 is 16301815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41925625 + 9884736 = 6475^2 + 3144^2 .

It is a cyclic number.

It is not a de Polignac number, because 51810361 - 2⁷ = 51810233 is a prime.

It is not a weakly prime, because it can be changed into another prime (51810391) 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, 25905180 + 25905181.

It is an arithmetic number, because the mean of its divisors is an integer number (25905181).

Almost surely, 2^51810361 is an apocalyptic number.

It is an amenable number.

51810361 is a deficient number, since it is larger than the sum of its proper divisors (1).

51810361 is an equidigital number, since it uses as much as digits as its factorization.

51810361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 51810361 is about 7197.9414418290. The cubic root of 51810361 is about 372.7968260066.

The spelling of 51810361 in words is "fifty-one million, eight hundred ten thousand, three hundred sixty-one".