51352181 has 2 divisors, whose sum is σ = 51352182. Its totient is φ = 51352180.

The previous prime is 51352163. The next prime is 51352201. The reversal of 51352181 is 18125315.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51351556 + 625 = 7166^2 + 25^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51352181 is a prime.

It is a super-4 number, since 4×51352181⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51352181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51352111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25676090 + 25676091.

It is an arithmetic number, because the mean of its divisors is an integer number (25676091).

Almost surely, 2^51352181 is an apocalyptic number.

It is an amenable number.

51352181 is a deficient number, since it is larger than the sum of its proper divisors (1).

51352181 is an equidigital number, since it uses as much as digits as its factorization.

51352181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 26.

The square root of 51352181 is about 7166.0436085751. The cubic root of 51352181 is about 371.6946394742.

Adding to 51352181 its reverse (18125315), we get a palindrome (69477496).

The spelling of 51352181 in words is "fifty-one million, three hundred fifty-two thousand, one hundred eighty-one".