51605253 has 12 divisors (see below), whose sum is σ = 85189728. Its totient is φ = 29488680.

The previous prime is 51605237. The next prime is 51605291. The reversal of 51605253 is 35250615.

51605253 is a `hidden beast` number, since 5 + 1 + 605 + 2 + 53 = 666.

51605253 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 51605253 - 2⁴ = 51605237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51605153) 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 11 ways as a sum of consecutive naturals, for example, 409503 + ... + 409628.

It is an arithmetic number, because the mean of its divisors is an integer number (7099144).

Almost surely, 2^51605253 is an apocalyptic number.

It is an amenable number.

51605253 is a deficient number, since it is larger than the sum of its proper divisors (33584475).

51605253 is a wasteful number, since it uses less digits than its factorization.

51605253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819144 (or 819141 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 51605253 is about 7183.6796281571. The cubic root of 51605253 is about 372.3042299675.

Adding to 51605253 its reverse (35250615), we get a palindrome (86855868).

The spelling of 51605253 in words is "fifty-one million, six hundred five thousand, two hundred fifty-three".