51530211723829 has 2 divisors, whose sum is σ = 51530211723830. Its totient is φ = 51530211723828.

The previous prime is 51530211723817. The next prime is 51530211723869. The reversal of 51530211723829 is 92832711203515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32723262180625 + 18806949543204 = 5720425^2 + 4336698^2 .

It is a cyclic number.

It is not a de Polignac number, because 51530211723829 - 2¹⁵ = 51530211691061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51530211723869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25765105861914 + 25765105861915.

It is an arithmetic number, because the mean of its divisors is an integer number (25765105861915).

Almost surely, 2^{51530211723829} is an apocalyptic number.

It is an amenable number.

51530211723829 is a deficient number, since it is larger than the sum of its proper divisors (1).

51530211723829 is an equidigital number, since it uses as much as digits as its factorization.

51530211723829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 907200, while the sum is 49.

The spelling of 51530211723829 in words is "fifty-one trillion, five hundred thirty billion, two hundred eleven million, seven hundred twenty-three thousand, eight hundred twenty-nine".