51605361 has 6 divisors (see below), whose sum is σ = 74541090. Its totient is φ = 34403568.

The previous prime is 51605341. The next prime is 51605371. The reversal of 51605361 is 16350615.

It is a happy number.

51605361 is a `hidden beast` number, since 51 + 605 + 3 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 44635761 + 6969600 = 6681^2 + 2640^2 .

It is not a de Polignac number, because 51605361 - 2⁹ = 51604849 is a prime.

It is a super-2 number, since 2×51605361² = 5326226567880642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51605321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2866956 + ... + 2866973.

It is an arithmetic number, because the mean of its divisors is an integer number (12423515).

Almost surely, 2^51605361 is an apocalyptic number.

It is an amenable number.

51605361 is a deficient number, since it is larger than the sum of its proper divisors (22935729).

51605361 is a wasteful number, since it uses less digits than its factorization.

51605361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5733935 (or 5733932 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 51605361 is about 7183.6871451922. The cubic root of 51605361 is about 372.3044896881.

Adding to 51605361 its reverse (16350615), we get a palindrome (67955976).

The spelling of 51605361 in words is "fifty-one million, six hundred five thousand, three hundred sixty-one".