51511444429 has 2 divisors, whose sum is σ = 51511444430. Its totient is φ = 51511444428.

The previous prime is 51511444427. The next prime is 51511444441. The reversal of 51511444429 is 92444411515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39431236329 + 12080208100 = 198573^2 + 109910^2 .

It is a cyclic number.

It is not a de Polignac number, because 51511444429 - 2¹ = 51511444427 is a prime.

Together with 51511444427, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 51511444391 and 51511444400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51511444427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25755722214 + 25755722215.

It is an arithmetic number, because the mean of its divisors is an integer number (25755722215).

Almost surely, 2^51511444429 is an apocalyptic number.

It is an amenable number.

51511444429 is a deficient number, since it is larger than the sum of its proper divisors (1).

51511444429 is an equidigital number, since it uses as much as digits as its factorization.

51511444429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 115200, while the sum is 40.

The spelling of 51511444429 in words is "fifty-one billion, five hundred eleven million, four hundred forty-four thousand, four hundred twenty-nine".