51605011 has 2 divisors, whose sum is σ = 51605012. Its totient is φ = 51605010.

The previous prime is 51605009. The next prime is 51605017. The reversal of 51605011 is 11050615.

51605011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51605011 - 2¹ = 51605009 is a prime.

Together with 51605009, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 51605011.

It is not a weakly prime, because it can be changed into another prime (51605017) 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, 25802505 + 25802506.

It is an arithmetic number, because the mean of its divisors is an integer number (25802506).

Almost surely, 2^51605011 is an apocalyptic number.

51605011 is a deficient number, since it is larger than the sum of its proper divisors (1).

51605011 is an equidigital number, since it uses as much as digits as its factorization.

51605011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 51605011 is about 7183.6627844018. The cubic root of 51605011 is about 372.3036479999.

Adding to 51605011 its reverse (11050615), we get a palindrome (62655626).

The spelling of 51605011 in words is "fifty-one million, six hundred five thousand, eleven".