51605013 has 16 divisors (see below), whose sum is σ = 74407680. Its totient is φ = 31689216.

The previous prime is 51605011. The next prime is 51605017. The reversal of 51605013 is 31050615.

It is a happy number.

51605013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51605013 - 2¹ = 51605011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51605011) 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 in 15 ways as a sum of consecutive naturals, for example, 8368 + ... + 13161.

It is an arithmetic number, because the mean of its divisors is an integer number (4650480).

Almost surely, 2^51605013 is an apocalyptic number.

It is an amenable number.

51605013 is a deficient number, since it is larger than the sum of its proper divisors (22802667).

51605013 is a wasteful number, since it uses less digits than its factorization.

51605013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21596.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 51605013 is about 7183.6629236066. The cubic root of 51605013 is about 372.3036528095.

Adding to 51605013 its reverse (31050615), we get a palindrome (82655628).

The spelling of 51605013 in words is "fifty-one million, six hundred five thousand, thirteen".