51651289 has 2 divisors, whose sum is σ = 51651290. Its totient is φ = 51651288.

The previous prime is 51651269. The next prime is 51651337. The reversal of 51651289 is 98215615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32114889 + 19536400 = 5667^2 + 4420^2 .

It is a cyclic number.

It is not a de Polignac number, because 51651289 - 2⁷ = 51651161 is a prime.

It is not a weakly prime, because it can be changed into another prime (51651209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25825644 + 25825645.

It is an arithmetic number, because the mean of its divisors is an integer number (25825645).

Almost surely, 2^51651289 is an apocalyptic number.

It is an amenable number.

51651289 is a deficient number, since it is larger than the sum of its proper divisors (1).

51651289 is an equidigital number, since it uses as much as digits as its factorization.

51651289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 37.

The square root of 51651289 is about 7186.8831213538. The cubic root of 51651289 is about 372.4149054156.

The spelling of 51651289 in words is "fifty-one million, six hundred fifty-one thousand, two hundred eighty-nine".