51242651 has 2 divisors, whose sum is σ = 51242652. Its totient is φ = 51242650.

The previous prime is 51242629. The next prime is 51242663. The reversal of 51242651 is 15624215.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51242651 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51242651.

It is not a weakly prime, because it can be changed into another prime (51242671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25621325 + 25621326.

It is an arithmetic number, because the mean of its divisors is an integer number (25621326).

Almost surely, 2^51242651 is an apocalyptic number.

51242651 is a deficient number, since it is larger than the sum of its proper divisors (1).

51242651 is an equidigital number, since it uses as much as digits as its factorization.

51242651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 26.

The square root of 51242651 is about 7158.3972368122. The cubic root of 51242651 is about 371.4301866160.

Adding to 51242651 its reverse (15624215), we get a palindrome (66866866).

The spelling of 51242651 in words is "fifty-one million, two hundred forty-two thousand, six hundred fifty-one".