51208061 has 2 divisors, whose sum is σ = 51208062. Its totient is φ = 51208060.

The previous prime is 51208049. The next prime is 51208067. The reversal of 51208061 is 16080215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39000025 + 12208036 = 6245^2 + 3494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51208061 is a prime.

It is a super-2 number, since 2×51208061² = 5244531022759442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51208067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25604030 + 25604031.

It is an arithmetic number, because the mean of its divisors is an integer number (25604031).

Almost surely, 2^51208061 is an apocalyptic number.

It is an amenable number.

51208061 is a deficient number, since it is larger than the sum of its proper divisors (1).

51208061 is an equidigital number, since it uses as much as digits as its factorization.

51208061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 51208061 is about 7155.9807853292. The cubic root of 51208061 is about 371.3465930870.

Adding to 51208061 its reverse (16080215), we get a palindrome (67288276).

The spelling of 51208061 in words is "fifty-one million, two hundred eight thousand, sixty-one".